Answered the Reformers point by point and reformed the discipline of the Church, over eighteen years and five popes.
These facts as given by the Catholic Encyclopedia (1913), "Councils" PD
Trent opens. Over eighteen years and five popes it answers the Reformers point by point — on Scripture and tradition, justification, the sacraments, the Eucharist, purgatory and the saints.
“receives and venerates with an equal affection of piety, and reverence, all the books both of the Old and of the New Testament… as also the said traditions, as well those appertaining to faith as to morals.”
“We are therefore said to be justified by faith, because faith is the beginning of human salvation, the foundation, and the root of all Justification; without which it is impossible to please God, and to come unto the fellowship of His sons: but we are therefore said to be justified freely, because that none of those things which precede justification—whether faith or works—merit the grace itself of justification.”
“If any one saith, that by faith alone the impious is justified; in such wise as to mean, that nothing else is required to co-operate in order to the obtaining the grace of Justification, and that it is not in any way necessary, that he be prepared and disposed by the movement of his own will; let him be anathema.”
“If any one saith, that the sacraments of the New Law were not all instituted by Jesus Christ, our Lord; or, that they are more, or less, than seven, to wit, Baptism, Confirmation, the Eucharist, Penance, Extreme Unction, Order, and Matrimony; or even that any one of these seven is not truly and properly a sacrament; let him be anathema.”
“If any one saith, that, in the sacred and holy sacrament of the Eucharist, the substance of the bread and wine remains conjointly with the body and blood of our Lord Jesus Christ, and denieth that wonderful and singular conversion of the whole substance of the bread into the Body, and of the whole substance of the wine into the Blood — the species only of the bread and wine remaining — which conversion indeed the Catholic Church most aptly calls Transubstantiation; let him be anathema.”
“the saints, who reign together with Christ, offer up their own prayers to God for men; that it is good and useful suppliantly to invoke them, and to have recourse to their prayers, aid, (and) help for obtaining benefits from God, through His Son, Jesus Christ our Lord, who is our alone Redeemer and Saviour.”
“there is a Purgatory, and that the souls there detained are helped by the suffrages of the faithful, but principally by the acceptable sacrifice of the altar.”
The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.