Unbelief is the greatest of sins.

There is nothing on this earth more to be prized than true friendship.

If there were some solitary or feral man, the passions of the soul would be sufficient for him; by them he would be conformed to things in order that he might have knowledge of them. But because man is naturally political and social, there is need for one man to make his conceptions known to others, which is done with speech. So significant speech was needed if men were to live together. Which is why those of different tongues do not easily live together.

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

Far graver is it to corrupt the faith that is the life of the soul than to counterfeit the money that sustains temporal life.

Do not wish to jump immediately from the streams to the sea, because one has to go through easier things to the more difficult.

Behold our refutation of the error. It is not based on documents of faith, but on the reasons and statements of the philosophers themselves. If then anyone there be who, boastfully taking pride in his supposed wisdom, wishes to challenge what we have written, let him not do it in some corner nor before children who are powerless to decide on such difficult matters. Let him reply openly if he dare. He shall find me there confronting him, and not only my negligible self, but many another whose study is truth.