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

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.

One day when Thomas Aquinas was preaching to the local populace on the love of God, he saw an old woman listening attentively to his every word. And inspired by her eagerness to learn more about her God whom she loved so dearly, he said to the people: It is better to be this unlearned woman, loving God with all her heart, than the most learned theologian lacking love.

It is a sin to regard the fact that God cannot do the impossible as a limitation on his powers.

Man should not consider his material possession his own, but as common to all, so as to share them without hesitation when others are in need.

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

If all the sins of the flesh are worthy of condemnation because by them man allows himself to be dominated by that which he has of the animal nature, much more deserving of condemnation are the sins against nature by which man degrades his own animal nature.