God, the supreme being, is neither circumscribed by space, nor touched by time; he cannot be found in a particular direction, and his essence cannot change. The secret conversation is thus entirely spiritual; it is a direct encounter between God and the soul, abstracted from all material constraints.

The world is divided into men who have wit and no religion and men who have religion and no wit.

Now it is established in the sciences that no knowledge is acquired save through the study of its causes and beginnings, if it has had causes and beginnings; nor completed except by knowledge of its accidents and accompanying essentials.

Those who deny the first principle should be flogged or burned until they admit that it is not the same thing to be burned and not burned, or whipped and not whipped.

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.

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