Excerpt of The Spiritual Exercises of St. Ignatius, by Louis J. Puhl, S.J. pp.141-150

313. RULES FOR DISCERNMENT OF SPIRITS
I

Rules for understanding to some extent the different movements produced in the soul and for recognizing those that are good to admit them, and those that are bad, to reject them. These rules are more suited to the first week
  

314.  I.  In the case of those who go from one mortal sin to another, the enemy is ordinarily accustomed to propose apparent pleasures. He fills their imagination with sensual delights and gratifications, the more readily to keep them in their vices and increase the number of their sins.

    With such persons the good spirit uses a method which is the reverse of the above. Making use of the light of reason, he will rouse the sting of conscience and fill them with remorse.

315.  2.  In the case of those who go on earnestly striving to cleanse their souls from sin and who seek to rise in the service of God our Lord to greater perfection, the method pursued is the opposite of that mentioned in the first rule.

    Then it is characteristic of the evil spirit to harass with anxiety, to afflict with sadness, to raise obstacles backed by fallacious reasonings that disturb the soul. Thus he seeks to prevent the soul from advancing.

    It is characteristic of the good spirit, however, to give courage and strength, consolations, tears, inspirations, and peace. This He does by making all easy, by removing all obstacles so that the soul goes forward in doing good.

316.  3.  SPIRITUAL CONSOLATION.  I call it consolation when an interior movement is aroused in the soul, by which it is inflamed with love of its Creator and Lord, and as a consequence, can love no creature on the face of the earth for its own sake, but only in the Creator of them all. It is likewise consolation when one sheds tears that move to the love of God, whether it be because of sorrow for sins, or because of the sufferings of Christ our Lord, or for any other reason that is immediately directed to the praise and service of God. Finally, I call consolation every increase of faith, hope, and love, and all interior joy that invites and attracts to what is heavenly and to the salvation of one's soul by filling it with peace and quiet in its Creator and Lord.

317.  4.  SPIRITUAL DESOLATION.  I call desolation what is entirely the opposite of what is described in the third rule, as darkness of soul, turmoil of spirit, inclination to what is low and earthly, restlessness rising from many disturbances and temptations which lead to want of faith, want of hope, want of love. The soul is wholly slothful, tepid, sad, and separated, as it were, from its Creator and Lord. For just as consolation is the opposite of desolation, so the thoughts that spring from consolation are the opposite of those that spring from desolation.

318.  5.  In time of desolation we should never make any change, but remain firm and constant in the resolution and decision which guided us the day before the desolation, or in the decision to which we adhered in the preceding consolation. For just as in consolation the good spirit guides and counsels us, so in desolation the evil spirit guides and counsels. Following his counsels we can never find the way to a right decision.

319.  6.  Though in desolation we must never change our former resolutions, it will be very advantageous to intensify our activity against the desolation. We can insist more upon prayer, upon meditation, and on much examination of ourselves. We can make an effort in a suitable way to do some penance.

320.  7.  When one is in desolation, he should be mindful that God has left him to his natural powers to resist the different agitations and temptations of the enemy in order to try him. He can resist with the help of God, which always remains, though he may not clearly perceive it. For though God has taken from him the abundance of fervor and overflowing love and the intensity of His favors, nevertheless, he has sufficient grace for eternal salvation.

321.  8.  When one is in desolation, he should strive to persevere in patience. This reacts against the vexations that have overtaken him. Let him consider, too, that consolation will soon return, and in the meantime, he must diligently use the means against desolation which have been given in the sixth rule.

322.  9.  The principal reasons why we suffer from desolation are three:

    The first is because we have been tepid and slothful or negligent in our exercises of piety, and so through our own fault spiritual consolation has been taken away from us.

    The second reason is because God wishes to try us, to see how much we are worth, and how much we will advance in His service and praise when left without the generous reward of consolations and signal favors.

    The third reason is because God wishes to give us a true knowledge and understanding of ourselves, so that we may have an intimate perception of the fact that it is not within our power to acquire and attain great devotion, intense love, tears, or any other spiritual consolation; but that all this is the gift and grace of God our Lord. God does not wish us to build on the property of another, to rise up in spirit in a certain pride and vainglory and attribute to ourselves the devotion and other effects of spiritual consolation.

323.  10.  When one enjoys consolation, let him consider how he will conduct himself during the time of ensuing desolation, and store up a supply of strength as defense against that day.

324.  11.  He who enjoys consolation should take care to humble himself and lower himself as much as possible. Let him recall how little he is able to do in time of desolation, when he is left without such grace or consolation.

    On the other hand, one who suffers desolation should remember that by making use of the sufficient grace offered him, he can do much to withstand all his enemies. Let him find his strength in his Creator and Lord.

325.  12.  The enemy conducts himself as a woman. He is a weakling before a show of strength, and a tyrant if he has his will. It is characteristic of a woman in a quarrel with a man to lose courage and take to flight if the man shows that he is determined and fearless. However, if the man loses courage and begins to flee, the anger, vindictiveness, and rage of the woman surge up and know no bounds. In the same way, the enemy becomes weak, loses courage, and turns to flight with his seductions as soon as one leading a spiritual life faces his temptations boldly, and does exactly the opposite of what he suggests. However, if one begins to be afraid and to lose courage in temptations, no wild animal on earth can be more fierce than the enemy of our human nature. He will carry out his perverse intentions with consummate malice.

326.  13.  Our enemy may also be compared in his manner of acting to a false lover. He seeks to remain hidden and does not want to be discovered. If such a lover speaks with evil intention to the daughter of a good father, or to the wife of a good husband, and seeks to seduce them, he wants his words and solicitations kept secret. He is greatly displeased if his evil suggestions and depraved intentions are revealed by the daughter to her father, or by the wife to her husband. Then he readily sees he will not succeed in what he has begun. In the same way, when the enemy of our human nature tempts a just soul with his wiles and seductions, he earnestly desires that they be received secretly and kept secret. But if one manifests them to a confessor, or to some other spiritual person who understands his deceits and malicious designs, the evil one is very much vexed. For he knows that he cannot succeed in his evil undertaking, once his evident deceits have been revealed.

327.  14.  The conduct of our enemy may also be compared to the tactics of a leader intent upon seizing and plundering a position he desires. A commander and leader of an army will encamp, explore the fortifications and defenses of the stronghold, and attack at the weakest point. In the same way, the enemy of our human nature investigates from every side all our virtues, theological, cardinal, and moral. Where he finds the defenses of eternal salvation weakest and most deficient, there he attacks and tries to take us by storm.

328. RULES FOR DISCERNMENT OF SPIRITS
II

Further rules for understanding the different movements produced in the soul. They serve for a more accurate discernment of spirits and are more suitable for the second week
  

329.  I.  It is characteristic of God and His Angels, when they act upon the soul, to give true happiness and spiritual joy, and to banish all the sadness and disturbances which are caused by the enemy.
   It is characteristic of the evil one to fight against such happiness and consolation by proposing fallacious reasonings, subtilties, and continual deceptions.

330.  2.  God alone can give consolation to the soul without any previous cause. It belongs solely to the Creator to come into a soul, to leave it, to act upon it, to draw it wholly to the love of His Divine Majesty. I said without previous cause, that is, without any preceding perception or knowledge of any subject by which a soul might be led to such a consolation through its own acts of intellect and will.

331.  3.  If a cause precedes, both the good angel and the evil spirit can give consolation to a soul, but for a quite different purpose. The good angel consoles for the progress of the soul, that it may advance and rise to what is more perfect. The evil spirit consoles for purposes that are the contrary, and that afterwards he might draw the soul to his own perverse intentions and wickedness.

332.  4.  It is a mark of the evil spirit to assume the appearance of an angel of light. He begins by suggesting thoughts that are suited to a devout soul, and ends by suggesting his own. For example, he will suggest holy and pious thoughts that are wholly in conformity with the sanctity of the soul. Afterwards, he will endeavor little by little to end by drawing the soul into his hidden snares and evil designs.

333.  5.  We must carefully observe the whole course of our thoughts. If the beginning and middle and end of the course of thoughts are wholly good and directed to what is entirely right, it is a sign that they are from the good angel. But the course of thoughts suggested to us may terminate in something evil, or distracting, or less good than the soul had formerly proposed to do. Again, it may end in what weakens the soul, or disquiets it; or by destroying the peace, tranquility, and quiet which it had before, it may cause disturbance to the soul. These things are a clear sign that the thoughts are proceeding from the evil spirit, the enemy of our progress and eternal salvation.

334.  6.  When the enemy of our human nature has been detected and recognized by the trail of evil marking his course and by the wicked end to which he leads us, it will be profitable for one who has been tempted to review immediately the whole course of the temptation. Let him consider the series of good thoughts, how they arose, how the evil one gradually attempted to make him step down from the state of spiritual delight and joy in which he was, till finally he drew him to his wicked designs. The purpose of this review is that once such an experience has been understood and carefully observed, we may guard ourselves for the future against the customary deceits of the enemy.

335.  7.  In souls that are progressing to greater perfection, the action of the good angel is delicate, gentle, delightful. It may be compared to a drop of water penetrating a sponge.
    The action of the evil spirit upon such souls is violent, noisy, and disturbing. It may be compared to a drop of water falling upon a stone.
    In souls that are going from bad to worse, the action of the spirits mentioned above is just the reverse. The reason for this is to be sought in the opposition or similarity of these souls to the different kinds of spirits. When the disposition is contrary to that of the spirits, they enter with noise and commotion that are easily perceived. When the disposition is similar to that of the spirits, they enter silently, as one coming into his own house when the doors are open.

336.  8.  When consolation is without previous cause, as was said, there can be no deception in it, since it can proceed from God our Lord only. But a spiritual person who has received such a consolation must consider it very attentively, and must cautiously distinguish the actual time of the consolation from the period which follows it. At such a time the soul is still fervent and favored with the grace and aftereffects of the consolation which has passed. In this second period the soul frequently forms various resolutions and plans which are not granted directly by God our Lord. They may come from our own reasoning on the relations of our concepts and on the consequences of our judgments, or they may come from the good or evil spirit. Hence, they must be carefully examined before they are given full approval and put into execution.

end of excerpt of The Spiritual Exercises of St. Ignatius