In the mere concept of one thing it cannot be found any character of its existence.

Reason can never prove the existence of God.

In every department of physical science there is only so much science, properly so-called, as there is mathematics.

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.

The busier we are, the more acutely we feel that we live, the more conscious we are of life.

To be beneficent when we can is a duty; and besides this, there are many minds so sympathetically constituted that, without any other motive of vanity or self-interest, they find a pleasure in spreading joy around them, and can take delight in the satisfaction of others so far as it is their own work. But I maintain that in such a case an action of this kind, however proper, however amiable it may be, has nevertheless no true moral worth, but is on a level with other inclinations. . . . For the maxim lacks the moral import, namely, that such actions be done from duty, not from inclination.

In all judgements by which we describe anything as beautiful, we allow no one to be of another opinion.