If a man deliberately abstains from wine to such an extent that he does serious harm to his nature, he will not be free from blame.

For those with faith, no evidence is necessary; for those without it, no evidence will suffice.

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.

Happiness is secured through virtue; it is a good attained by man's own will.

Sloth is sluggishness of the mind which neglects to begin good...it is evil in its effect, if it so oppresses man as to draw him away entirely from good deeds.

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.

There must be must be a first mover existing above all – and this we call God.