The knowledge of anything, since all things have causes, is not acquired or complete unless it is known by its causes.

A horse is simply a horse.

As to the mental essence, we find it in infants devoid of every mental form.

Is it the fault of wine if a fool drinks it and goes stumbling into darkness?

Pure earth does not petrify, because the predominance of dryness over [i.e. in] the earth endows it not with coherence but rather with crumbliness. In general, stone is formed in two ways only (a) through the hardening of clay, and (b) by the congelation [of waters].

An ignorant doctor is the aide-de-camp of death.

Medicine is the science by which we learn the various states of the human body in health and when not in health, and the means by which health is likely to be lost and, when lost, is likely to be restored back to health. In other words, it is the art whereby health is conserved and the art whereby it is restored after being lost. While some divide medicine into a theoretical and a practical [applied] science, others may assume that it is only theoretical because they see it as a pure science. But, in truth, every science has both a theoretical and a practical side.