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

Medicine is the restoration of discordant elements.

The light and heat of the universe comes from the sun, and its cold and darkness from the withdrawal of the sun.

Thirst will parch your tongue and your body will waste through lack of sleep ere you can describe in words that which painting instantly sets before the eye.

The acquisition of knowledge is always of use to the intellect, because it may thus drive out useless things and retain the good. For nothing can be loved or hated unless it is first known.

Let proportion be found not only in numbers and measures, but also in sounds, weights, times, and positions, and what ever force there is.

Necessity is the mistress and guide of nature.