Quotable Quotes by Saint Thomas Aquinas

A man has free choice to the extent that he is rational.
– Saint Thomas Aquinas
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.
– Saint Thomas Aquinas
All that is true, by whomsoever it has been said has its origin in the Spirit.
– Saint Thomas Aquinas
All the efforts of the human mind cannot exhaust the essence of a single fly.
– Saint Thomas Aquinas
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.
– Saint Thomas Aquinas
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.
– Saint Thomas Aquinas
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.
– Saint Thomas Aquinas
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.
– Saint Thomas Aquinas
Better to illuminate than merely to shine, to deliver to others contemplated truths than merely to contemplate.
– Saint Thomas Aquinas
Beware of the person of one book.
– Saint Thomas Aquinas
Beware the man of one book.
– Saint Thomas Aquinas
By nature all men are equal in liberty, but not in other endowments.
– Saint Thomas Aquinas
Clearly the person who accepts the Church as an infallible guide will believe whatever the Church teaches.
– Saint Thomas Aquinas
Faith has to do with things that are not seen and hope with things that are not at hand.
– Saint Thomas Aquinas
Final and perfect happiness can consist in nothing else than the vision of the Divine Essence... For perfect happiness the intellect needs to reach the very Essence of the First Cause. And thus it will have its perfection through union with God... in which alone man's happiness consists, as stated above.
– Saint Thomas Aquinas
For loving draws us more to things than knowing does, since good is found by going to the thing, whereas the true is found when the thing comes to us.
– Saint Thomas Aquinas
Friendship is the source of the greatest pleasures, and without friends even the most agreeable pursuits become tedious.
– Saint Thomas Aquinas
Good can exist without evil, whereas evil cannot exist without good.
– Saint Thomas Aquinas
Happiness is secured through virtue; it is a good attained by man's own will.
– Saint Thomas Aquinas
Hold firmly that our faith is identical with that of the ancients. Deny this, and you dissolve the unity of the Church.
– Saint Thomas Aquinas