The desire which a man has for a woman is not directed towards her because she is a human being, but because she is a woman ; that she is a human being is of no concern to the man; only her sex is the object of his desires.

What are the aims which are at the same time duties? They are perfecting of ourselves, the happiness of others.

It is therefore correct to say that the senses do not err — not because they always judge rightly, but because they do not judge at all.

Nature, when left to universal laws, tends to produce regularity out of chaos.

If education is to develop human nature so that it may attain the object of its being, it must involve the exercise of judgment.

Deaths, births, and marriages, considering how much they are separately dependent on the freedom of the human will, should seem to be subject to no law according to which any calculation could be made beforehand of their amount; and yet the yearly registers of these events in great countries prove that they go on with as much conformity to the laws of nature as the oscillations of the weather.

Philosophy stands in need of a science which shall determine the possibility, principles, and extent of human knowledge à priori.