The interpretation of dreams is a great art.

Many have said of Alchemy, that it is for the making of gold and silver. For me such is not the aim, but to consider only what virtue and power may lie in medicines.

Fasting is the greatest remedy-- the physician within.

Man is ill because he is never still.

Men who are devoid of the power of spiritual perception are unable to recognize anything that cannot be seen externally.

For one country is different from another; its earth is different, as are its stones, wines, bread, meat, and everything that grows and thrives in a specific region.

That which lives on reason lives against the spirit.