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

Better to illuminate than merely to shine; to deliver to others contemplated truths than merely to contemplate.

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.

He who achieves power by violence does not truly become lord or master.

He that obstinately denieth the truth before men upon earth, wilfully refuseth his soul's health in heaven.

Since faith rests upon infallible truth, and since the contrary of a truth can never be demonstrated, it is clear that the arguments brought against faith cannot be demonstrations, but are difficulties that can be answered.

The celestial bodies are the cause of all that takes place in the sublunar world.