Friendship is the source of the greatest pleasures, and without friends even the most agreeable pursuits become tedious.
Good can exist without evil, whereas evil cannot exist without good.
Happiness is secured through virtue; it is a good attained by man's own will.
Clearly the person who accepts the Church as an infallible guide will believe whatever the Church teaches.
Better to illuminate than merely to shine, to deliver to others contemplated truths than merely to contemplate.
By nature all men are equal in liberty, but not in other endowments.
A man has free choice to the extent that he is rational.
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
If forgers and malefactors are put to death by the secular power, there is much more reason for excommunicating and even putting to death one convicted of heresy.
If the highest aim of a captain were to preserve his ship, he would keep it in port forever.
Love takes up where knowledge leaves off.
In order for a war to be just, three things are necessary. First, the authority of the sovereign. Secondly, a just cause. Thirdly, a rightful intention.
Love must precede hatred, and nothing is hated save through being contrary to a suitable thing which is loved. And hence it is that every hatred is caused by love
Law; an ordinance of reason for the common good, made by him who has care of the community.
It is requisite for the relaxation of the mind that we make use, from time to time, of playful deeds and jokes.
Justice is a certain rectitude of mind whereby a man does what he ought to do in the circumstances confronting him.