It is not certain that everything is uncertain.

Descartes useless and uncertain.

Atheism shows strength of mind, but only to a certain degree.

Console thyself, thou wouldst not seek Me, if thou hadst not found Me

If we must not act save on a certainty, we ought not to act on religion, for it is not certain. But how many things we do on an uncertainty, sea voyages, battles!

How vain is painting, which is admired for reproducing the likeness of things whose originals are not admired.