Science is what you know, philosophy is what you don't know.
The essence of good manners consists in making it clear that one has no wish to hurt. When it is clearly necessary to hurt, it must be done in such a way as to make it evident that the necessity is felt to be regrettable.
A man of Seville is shaved by the Barber of Seville if and only if the man does not shave himself. Does the barber shave himself?
Human nature is so constructed that it gives affection most readily to those who seem least to demand it.
The frequency with which a man experiences lust depends upon his own physical condition, whereas the occasion which rouse such feelings in him depend upon the social conventions to which he is accustomed