"Man cannot get beyond his true nature. He may indeed by means of the imagination conceive individuals of another so-called higher kind, but he can never get loose from his species, his nature; the conditions of being, the positive final predicates which he gives to these other individuals, are always determinations or qualities drawn from his own nature – qualities in which he in truth only images and projects himself."

Life changing. Probably the best work of philosophy I've read. Despite being an argument against religion, it deeply respects the religious man. Main premise is that we can ascribe the qualities of God to ourselves if we will it.