To pretend angels do not exist because they are invisible is to believe we never sleep because we don't see ourselves sleeping.

Theology is taught by God, teaches God, and leads to God.

This Blood that but one drop of has the power to win all the world forgiveness of its world of sin.

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.

A person is disposed to an act of choice by an angel ... in two ways. Sometimes, a man's understanding is enlightened by an angel to know what is good, but it is not instructed as to the reason why ... But sometimes he is instructed by angelic illumination, both that this act is good and as to the reason why it is good.

He suddenly announced that he could not write any more since "All that I have written seems like straw to me."

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.