Some children are born from heaven and others are born from hell, because each human being has his inherent tendencies, and these tendencies belong to his spirit, and indicate the state in which he existed before he was born.

Poison is in everything, and no thing is without poison. The dosage makes it either a poison or a remedy.

All things are poisons. It is simply the dose that distinguishes between a poison and a remedy.

Time is a brisk wind, for each hour it brings something new... but who can understand and measure its sharp breath, its mystery and its design?

Women's regular bleeding engenders phantoms.

Could we but rightly comprehend the mind of man, nothing would be impossible to us upon the earth.

Once a disease has entered the body, all parts which are healthy must fight it: not one alone, but all. Because a disease might mean their common death. Nature knows this; and Nature attacks the disease with whatever help she can muster.