Not to know of what things one should demand demonstration, and of what one should not, argues want of education.

Music directly represents the passions of the soul. If one listens to the wrong kind of music, he will become the wrong kind of person.

Salt water when it turns into vapour becomes sweet, and the vapour does not form salt water when it condenses again. This I know by experiment. The same thing is true in every case of the kind: wine and all fluids that evaporate and condense back into a liquid state become water. They all are water modified by a certain admixture, the nature of which determines their flavour.

Excellence is never an accident. It is always the result of high intention, sincere effort, and intelligent execution; it represents the wise choice of many alternatives - choice, not chance, determines your destiny.

There is no great genius without a mixture of madness.

Adoration is made out of a solitary soul occupying two bodies.

In the works of Nature, purpose, not accident, is the main thing.