We set forth our petitions before God, not in order to make known to Him our needs and desires, but rather so that we ourselves may realize that in these things it is necessary to turn to God for help.

The truth of our faith becomes a matter of ridicule among the infidels if any Catholic, not gifted with the necessary scientific learning, presents as dogma what scientific scrutiny shows to be false.

Grace does not destroy nature, it perfects it.

Wonder is the desire of knowledge.

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.

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

The Study of philosophy is not that we may know what men have thought, but what the truth of things is.