AE 15:147: But the dead know nothing, and they have no more reward [Ecclesiastes 9:5]. Jerome has clumsily distorted this passage to apply to the reward of the dead in purgatory. Solomon seems to feel that the dead are asleep in such a way that they know nothing whatever. And I do not believe that there is a more powerful passage in Scripture to show that the dead are asleep and do not know anything about our affairs—this in opposition to the invocation of the saints and the fiction of purgatory."
AE 37:369: “Nor have we anything in Scripture concerning purgatory. It too was certainly fabricated by goblins. Therefore, I maintain it is not necessary to believe in it; although all things are possible to God, and he could very well allow souls to be tormented after their departure from the body. But he has caused nothing of this to be spoken or written, therefore he does not wish to have it believed, either. I know of a purgatory, however, in another way, but it would not be proper to teach anything about it in the church, nor on the other hand, to deal with it by means of endowments or vigils.”