Pray thee, spare, thyself at times: for it becomes a wise man sometimes to relax the high pressure of his attention to work.

Good can exist without evil, whereas evil cannot exist without good.

I answer that, Even, as in the blessed in heaven there will be most perfect charity, so in the damned there will be the most perfect hate.

Better to illuminate than merely to shine; to deliver to others contemplated truths than merely to contemplate.

The soul, which is the first principle of life, is not a body, but the act of a body; just as heat, which is the principle of calefaction, is not a body, but an act of a body.

Christ was either liar, lunatic, or Lord!

There is but one Church in which men find salvation, just as outside the ark of Noah it was not possible for anyone to be saved.