The wisest and noblest teacher is nature itself.

Therefore, O students, study mathematics and do not build without foundations.

Who sows virtue ought to reap honour.

The men of experiment are like the ant; they only collect and use. But the bee...gathers its materials from the flowers of the garden and of the field, but transforms and digests it by a power of its own.

Movement will fail sooner than usefulness.

Man's external form, marvellously constructed, is not much as compared with the divine soul that dwells inside that structure.

The eye which turns from a white object in the light of the sun and goes into a less fully lighted place will see everything as dark.