Man has free choice, or otherwise counsels, exhortations, commands, prohibitions, rewards and punishments would be in vain.

The celestial bodies are the cause of all that takes place in the sublunar world.

The greatest kindness one can render to any man consists in leading him from error to truth.

If... the motion of the earth were circular, it would be violent and contrary to nature, and could not be eternal, since ... nothing violent is eternal .... It follows, therefore, that the earth is not moved with a circular motion.

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.

Not everything that is more difficult is more meritorious.

We should love others truly, for their own sakes rather than our own.