The theology of the council of Trent on justification and grace is the theology of arminianism and modern evangelicalism. If you extract certain statements on here and sermonize them, you get evangelical "preaching". These doctrines give men false hope in their experiences and prayers, they destroy grace, true hope, thankfulness and a true sense of sin and trust on the Lord to remove it.
Preparationism, decisionism and the like are derived from Catholic teaching and run contrary to the word of God, which declares that we were born again according to the will of God John 1:13; James 1:18. It is not simply a matter of "works versus faith" it is about who is saving whom, and if we leave the slightest door to human cooperation, we enter into dangerous territory. Grace is to be understood as an unreturnable, irrevocable gift.
Plain experience in preaching the gospel teaches us that people, who once rebelled against God and his Christ are suddenly "broken" and won over by the power of the gospel. Even an preacher who believes in free will will acknowledge this, if he has truly preached the gospel among sinners. There is no anticipation or human disposition as the Spirit falls on men. John 3:8. This is part of grace and it doesn't fit with the procedure of the decisionist evangelicals, who claim to "lead people to the Lord", while the only thing that can truly lead a person to the truth is the Holy Ghost John 16. Human persuasion can, at most, bring a person to an intellectual assent, but can never change his heart. But the Holy Ghost is stronger than Satan and can pull down his fortresses at once. The battle for souls is not decided by the captives, or the field.
"But where sin abounded, grace did much more abound:"
"They also that erred in spirit shall come to understanding, and they that murmured shall learn doctrine."
Casting down imaginations, and every high thing that exalteth itself against the knowledge of God, and bringing into captivity every thought to the obedience of Christ. 2 Cor 10:5
As soon as they hear of me, they shall obey me: the strangers shall submit themselves unto me. The strangers shall fade away, and be afraid out of their close places. Psalm 18:44-45
Where the word of a king is, there is power. Ecclesiastes 8:4
Thy people shall be willing in the day of thy power, Psalms 110:3
They shall speak of the glory of thy kingdom, and talk of thy power Psalms 145:11
For I am not ashamed of the gospel of Christ: for it is the power of God unto salvation to every one that believeth; to the Jew first, and also to the Greek.
THE COUNCIL OF TRENT Session VI - Celebrated on the thirteenth day of January,1547 under Pope Paul III
THE NECESSITY OF PREPARATION FOR JUSTIFICATION IN ADULTS, AND WHENCE IT
It is furthermore declared that in adults the beginning of that justification must proceed from the predisposing grace of God through Jesus Christ, that is, from His vocation, whereby, without any merits on their part, they are called; that they who by sin had been cut off from God, may be disposed through His quickening and helping grace to convert themselves to their own justification by freely assenting to and cooperating with that grace; so that, while God touches the heart of man through the illumination of the Holy Ghost, man himself neither does absolutely nothing while receiving that inspiration, since he can also reject it, nor yet is he able by his own free will and without the grace of God to move himself to justice in His sight.
CHAPTER VIII. IN WHAT THE JUSTIFICATION OF THE SINNER CONSISTS, AND WHAT ARE ITS CAUSES
Whence also they hear immediately the word of Christ:
If thou wilt enter into life, keep the commandments.
This disposition or preparation is followed by justification itself, which is not only a remission of sins but also the sanctification and renewal of the inward man through the voluntary reception of the grace and gifts whereby an unjust man becomes just and from being an enemy becomes a friend, that he may be an heir according to hope of life everlasting.
For God does not command impossibilities, but by commanding admonishes thee to do what thou canst and to pray for what thou canst not, and aids thee that thou mayest be able.
RASH PRESUMPTION OF PREDESTINATION IS TO BE AVOIDED
No one, moreover, so long as he lives this mortal life, ought in regard to the sacred mystery of divine predestination, so far presume as to state with absolute certainty that he is among the number of the predestined, as if it were true that the one justified either cannot sin any more, or, if he does sin, that he ought to promise himself an assured repentance.
For except by special revelation, it cannot be known whom God has chosen to Himself.
Canon 4. If anyone says that man's free will moved and aroused by God, by assenting to God's call and action, in no way cooperates toward disposing and preparing itself to obtain the grace of justification, that it cannot refuse its assent if it wishes, but that, as something inanimate, it does nothing whatever and is merely passive, let him be anathema.
Canon 5. If anyone says that after the sin of Adam man's free will was lost and destroyed, or that it is a thing only in name, indeed a name without a reality, a fiction introduced into the Church by Satan, let him be anathema.
Canon 9.If anyone says that the sinner is justified by faith alone, meaning that nothing else is required to cooperate in order to obtain the grace of justification, and that it is not in any way necessary that he be prepared and disposed by the action of his own will, let him be anathema.
Canon 11.If anyone says that men are justified either by the sole imputation of the justice of Christ or by the sole remission of sins, to the exclusion of the grace and the charity which is poured forth in their hearts by the Holy Ghost, and remains in them, or also that the grace by which we are justified is only the good will of God, let him be anathema.
Canon 16.If anyone says that he will for certain, with an absolute and infallible certainty, have that great gift of perseverance even to the end, unless he shall have learned this by a special revelation, let him be anathema.
Canon 17.If anyone says that the grace of justification is shared by those only who are predestined to life, but that all others who are called are called indeed but receive not grace, as if they are by divine power predestined to evil, let him be anathema.
Canon 18. If anyone says that the commandments of God are, even for one that is justified and constituted in grace, impossible to observe, let him be anathema.