Work before eating, rest after eating. Eat not ravenously, filling the mouth gulp after gulp without breathing space.

No disease that can be treated by diet should be treated with any other means.

The same is the case with those opinions of man to which he has been accustomed from his youth; he likes them, defends them, and shuns the opposite views.

Be convinced that, if man were able to reach the end without preparatory studies, such studies would not be preparatory but tiresome and utterly superfluous.

The soul is subject to health and disease, just as is the body. The health and disease of both . . . undoubtedly depend upon beliefs and customs, which are peculiar to mankind.

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.

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