There is nothing on this earth more to be prized than true friendship.

Pain itself can be pleasurable accidentally in so far as it is accompanied by wonder, as in stage-plays; or in so far as it recalls a beloved object to one's memory, and makes one feel one's love for the thing, whose absence gives us pain. Consequently, since love is pleasant, both pain and whatever else results from love, in so far as they remind us of our love, are pleasant.

It [covetousness] is a sin against God, just as all mortal sins, in as much as man condemns things eternal for the sake of temporal things.

All the efforts of the human mind cannot exhaust the essence of a single fly.

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

Peace is the work of justice indirectly, in so far as justice removes the obstacles to peace; but it is the work of charity (love) directly, since charity, according to its very notion, causes peace.

An act of love always tends towards two things; to the good that one wills, and to the person for whom one wills it.