You must consider, when reading this treatise, that mental perception, because connected with matter, is subject to conditions similar to those to which physical perception is subject.

Know that for the human mind there are certain objects of perception which are within the scope of its nature and capacity; on the other hand, there are, amongst things which actually exist, certain objects which the mind can in no way and by no means grasp: the gates of perception are closed against it.

A wise man is a greater asset to a nation than a king.

While one man can discover a certain thing by himself, another is never able to understand it, even if taught by means of all possible expressions and metaphors, and during a long period; his mind can in no way grasp it, his capacity is insufficient for it.

Those who grieve find comfort in weeping and in arousing their sorrow until the body is too tired to bear the inner emotions.

The goal of good health is to enable a person to acquire wisdom.

He who does not understand that a dead lion is more alive than a living dog will remain a dog.