From time immemorial artistic insights have been revealed to artists in their sleep and in dreams, so that at all times they ardently desired them.

It is said that a wise man rules over the stars, but this does not mean that he rules over the influences which come from the stars in the sky. It means that he rules over the powers which exist in his own constitution.

All things are poisons, for there is nothing without poisonous qualities. It is only the dose which makes a thing poison.

Every physician must be rich in knowledge, and not only of that which is written in books; his patients should be his book, they will never mislead him.

If we want to make a statement about a man's nature on the basis of his physiognomy, we must take everything into account; it is in his distress that a man is tested, for then his nature is revealed.

All drugs are poisons the benefit depends on the dosage.

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?