Practical sciences proceed by building up; theoretical science by resolving into components.

I would rather feel compassion than know the meaning of it. I would hope to act with compassion without thinking of personal gain.

Hold firmly that our faith is identical with that of the ancients. Deny this, and you dissolve the unity of the Church.

It is not theft, properly speaking, to take secretly and use another's property in a case of extreme need: because that which he takes for the support of his life becomes his own property by reason of that need

Man can sin against nature in two ways. First, when he sins against his specific rational nature, acting contrary to reason. In this sense, we can say that every sin is a sin against man's nature, because it is against man's right reason.

Beware the man of a single book.

The existence of a prime mover- nothing can move itself; there must be a first mover. The first mover is called God.