Translation from Original & Fr. Gallagher's Summary
The 14 Rules for Discernment of Spirits summarized from Fr. Timothy Gallagher*
Rules for becoming aware and understanding to some extent the different movements which are caused in the soul, the good, to receive them, and the bad to reject them. And these rules are more proper for the First Week (of the Spiritual Exercises).
First Rule. For persons who are going from mortal sin to mortal sin · In these persons the enemy is ordinarily accustomed to propose apparent pleasures to them, leading them to imagine sensual delights and pleasures in order to hold them more and make them growing their vices and sins. · In these persons the good spirit uses a contrary method, stinging and biting their consciences through their rational power of moral judgment.
Second rule. For persons moving from good to better In persons who are going on intensely purifying their sins and rising from good to better in the service of God our Lord, the method is contrary to that in the first rule. · For then it is proper to the evil spirit to bite, sadden, and place obstacles, disquieting with false reasons, so that the person may not go forward. · And it is proper to the good spirit to give courage and strength, consolations, tears, inspirations and quiet, easing and taking away all obstacles, so that the person may go forward in doing good. Third Rule. Spiritual Consolation. · I call it consolation when some interior movements is caused in the soul, through which the soul comes to be inflamed with love of its Creator and Lord, and, consequently when it can love no created thing on the face of the earth in itself, but only in the Creator of them all. · Likewise when it sheds tears that move to love of its Lord, whether out of sorrow for one’s sins, or for the passion of Christ our Lord, or because of other things directly ordered to his service and praise. · Finally, I call consolation every increase of hope, faith and charity,and all interior joy that calls and attracts to heavenly things and to the salvation of one’s soul, quieting it and giving it peace in its Creator and Lord. Fourth Rule. Spiritual Desolation. · I call desolation all the contrary of the third rule, such as darkness of soul, disturbance in it, movement to low and earthly things, disquiet from various agitations and temptations, moving to lack of confidence, without hope, without love, finding oneself totally slothful, tepid, sad and, as if separated from one’s Creator and Lord. · For just as consolation is contrary to desolation, in the same way the thoughts that come from consolation are contrary to the thoughts that come from desolation.
Fifth Rule. Never make a change. · In time of desolation never make a change, but be firm and constant in the proposals and determination in which one was the day preceding such desolation, or in the determination in which one was in the preceding consolation. · Because, as in consolation the good spirit guides and counsels us more, so in desolation the bad spirit, with whose counsels we cannot find theway to a right decision. Sixth Rule. The type of change needed prayer of petition. Although in desolation we should not change our first proposals, it is very advantageous to change ourselves intensely against the desolation itself as by insisting more upon prayer, meditation, upon much examination, and upon extending ourselves in some suitable way of doing penance.
Seventh Rule. In desolation left to our natural powers, we are to resist since we have sufficient grace, though we do not feel it. Let one who is in desolation consider how the Lord has left him in trial in his natural powers, so that he may resist the various agitations and temptations of the enemy; since he can resist with the divine help, which always remains with him, though he does not clearly feel it; for the Lord has taken away from him his great fervor, abundant love and intense grace, leaving him, however, sufficient grace for eternal salvation. Eighth rule. To be patience, and work contrary to negative movements. Let one who is in desolation work to be in patience, which is contrary to the vexations which come to him, and let him think that he will soon be consoled,diligently using the means against such desolation, as is said in the sixth rule.
Ninth rule. The 3 potential causes of desolation. There are three principal causes for which we find ourselves desolate. · The first is because we are tepid, slothful or negligent in our spiritual exercises, and so through our faults spiritual consolation withdraws from us. · The second, to try us and see how much we are and how much we extend ourselves in his service and praise without so much payment of consolations and increased graces. · The third, to give us true recognition and understanding so that we may interiorly feel that it is not ours to attain or maintain increased devotion, intense love, tears or any other spiritual consolation, but that all is the gift and grace of God our Lord, and so that we may not build a nest in something belonging to another, raising our mind in some pride or vainglory, attributing to ourselves the devotion or the other parts of the spiritual consolation.
Tenth rule. When in consolation prepare for desolation and what will do when in it. Let the one who is in consolation think how he will conduct himself in the desolation which will come after,taking new strength for that time.
Eleventh Rule. Be humble in consolation and in desolation remember we have sufficient grace taking strength from God: · Let one who is consoled seek to humble himself and lower himself as much as he can, thinking of how little he is capable in the time of desolation without such grace or consolation. · On the contrary, let one who is in desolation think that he can do much with God’s sufficient grace to resist all his enemies, taking strength in his Creator and Lord. Twelfth Rule. Stand Strong.
How the enemy acts when faced with strength or weakness. o it is proper to the enemy to weaken and lose heart, fleeing and ceasing his temptations when the person who is exercising himself in spiritual things confronts the temptations of the enemy firmly, doing what is diametrically opposed to them; and, o on the contrary, if the person who is exercising himself begins to be afraid and lose heart in suffering the temptations, there is no beast so fierce on the face of the earth as the enemy of human nature in following out his damnable intention with such growing malice.
Thirteenth Rule. Break the Silence
How the enemy wanting to keep secrets, will flee if such is shared with another.
When the enemy of human nature brings his wiles and persuasions to the just soul, he wishes and desires that they be received and kept in secret; but when one reveals them to one’s good confessor or to another spiritual person, who knows his deceits and malicious designs, it weighs on him very much, because he perceives that he will not be able to succeed with the malicious undertaking he has begun, since his manifest deceits have been revealed.
Fourteenth Rule. Strengthen our weakest point.
The enemy looks for our weakest point to tempt us.
He, the enemy, conducts himself as a leader, intent upon conquering and robbing what he desires. For, just as a captain and leader of an army in the field, pitching his camp and exploring the fortifications and defenses of a stronghold, attacks it at the weakest point, in the same way the enemy of human nature, roving about, looks in turn at all our theological, cardinal and moral virtues; and where he finds us weakest and most in need for our eternal salvation, there he attacks us and attempts to take us.
* Slight modifications for additional clarity taken from Fr. Timothy Gallagher, OMV, The Discernment of Spirits: An Ignatian Guide to Everyday Living (New York: Crossroad, 2005), 7-10) course on teaching discernment.

TRANSLATION from ORIGINAL
14 Rules for the Discernment of Spirits for the First Week of The Spiritual Exercises of St. Ignatius of Loyola translated from the original by Louis J. Puhl, SJ
SE 313 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
RULE 1
SE 314 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.