“Now they (adults) are disposed unto the said justice, when, excited and assisted by divine grace, conceiving faith by hearing, they are freely moved towards God, believing those things to be true which God has revealed and promised, – and this especially, that God justifies the impious by His grace, through the redemption that is in Christ Jesus”

–  Council of Trent, Decree on Justification

“If anyone says that divine faith is not to be distinguished from natural knowledge about God and moral matters, and consequently that for divine faith it is not required that revealed truth should be believed because of the authority of God who reveals it: let him be anathema.”

–  First Vatican Council, Dei Filius

A system of morality based exclusively on human reason robs man of his highest dignity and lowers him from the supernatural to the merely natural life. Not but that man is able by the right use of reason to know and to obey certain principles of the natural law. But though he should know them all and keep them inviolate through life-and even this is impossible without the aid of the grace of our Redeemer-still it is vain for anyone without faith to promise himself eternal salvation. ‘If anyone abide not in Me, he shall be cast forth as a branch, and shall wither, and they shall gather him up and cast him into the fire, and he burneth’ (John XV., 6). ‘He that believeth not shall be condemned’ (Mark XVI., 16).

–  Leo XIII, Tametsi Futura Prospicientibus

“We declare that the greater number of those who are condemned to eternal punishment suffer that everlasting calamity because of ignorance of those mysteries of faith which must be known and believed in order to be numbered among the elect.”

–  Pius X, Acerbo Nimis