It is fear and terror that make all men brave, except the philosophers. Yet it is illogical to be brave through fear and cowardice.
A work well begun is half-ended.
There must always remain something that is antagonistic to good.
Many are the thyrsus-bearers, but few are the mystics.
Knowledge is the rediscovering of our own insight.
He is unworthy of the name of man who is ignorant of the fact that the diagonal of a square is incommensurable with its side.