Prayer is that which enables the soul to realize its divinity. Through prayer human beings worship absolute truth, and seek an eternal reward. Prayer is the foundation-stone of religion; and religion is the means by which the soul is purified of all that pollutes it. Prayer is the worship of the first cause of all things, the supreme ruler of all the world, the source of all strength. Prayer is the adoration of the one whose being is necessary.

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].

The more brilliant the lightning, the quicker it disappears.

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

That whose existence is necessary must necessarily be one essence.

Medicine considers the human body as to the means by which it is cured and by which it is driven away from health.

The different sorts of madness are innumerable.