Saint Thomas Aquinas said:

How can we live in harmony? First we need to know we are all madly in love with the same God.

Man cannot live without joy; therefore when he is deprived of true spiritual joys it is necessary that he become addicted to carnal pleasures.

A man has free choice to the extent that he is rational.

A man should remind himself that an object of faith is not scientifically demonstrable, lest presuming to demonstrate what is of faith, he should produce inconclusive reasons and offer occasion for unbelievers to scoff at a faith based on such ground.

All that is true, by whomsoever it has been said has its origin in the Spirit.

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

And therefore the Philosopher [Aristotle] says in Metaphysics VI that good and evil, which are objects of the will, are in things, but truth and error, which are objects of the intellect, are in the mind.

As regards the individual nature, woman is defective and misbegotten, for the active power of the male seed tends to the production of a perfect likeness in the masculine sex; while the production of a woman comes from defect in the active power.

Because of the diverse conditions of humans, it happens that some acts are virtuous to some people, as appropriate and suitable to them, while the same acts are immoral for others, as inappropriate to them.

Because philosophy arises from awe, a philosopher is bound in his way to be a lover of myths and poetic fables. Poets and philosophers are alike in being big with wonder.