Jude 1:15

And to convict all the impious. He actually states that the seventh from Adam is Enoch, who prophesied these things, to confirm by example what he stated above: Because the impious men who long ago were designated for such judgment had slipped in at his time to subvert the faith of the pious.

And to convict (he says) all the impious of all their deeds of impiety, etc. This sentiment is indeed true, because the Lord, coming in judgment, will convict the impious not only of deeds but also of words, and will judge the wicked; however, it should be known that the book of Enoch, from which this is taken, is classified among the apocryphal Scriptures by the Church, not because the sayings of such a great patriarch can be in any way dismissed or should be considered false, but because the book offered under his name does not seem to have been truly written by him, but published by another person under his title. For if it were truly his, it would not be contrary to sound faith. But now, because it contains many incredible things, among which is the account of the giants not having human fathers but angels, it is clear to the learned that the writings that are tainted with falsehood are not those of a truthful man. Hence, this same Epistle of Jude, because it bears testimony from an apocryphal book, was rejected by many in the early times. However, due to its authority, antiquity, and use, it has merited to be counted among the holy Scriptures, especially because Jude took such testimony from an apocryphal book which is conspicuous for the clear truth of its true light rather than being apocryphal and dubious.