Brutal attack on the Materialists from St. Garrigou-Lagrange
"Demons do not reveal themselves clearly to materialists. It suffices for them that creatures made in the image of God believe they draw their origin from ridiculous, weak, and lustful monkeys.If the demons were to manifest themselves to materialists, the latter would have a proof for the existence of spirits and a way toward faith in the existence of God.
However, the demons do reveal themselves more clearly to the hidden depths of the Masonic sect."