I learned to honor human beings, and I would find myself far more useless than the common laborer if I did not believe that this consideration could impart to all others a value establishing the rights of humanity.

The greatest problem for the human species, the solution of which nature compels him to seek, is that of attaining a civil society which can administer justice universally.

Act only according to that maxim whereby you can at the same time will that it should become a universal law.

When I could have used a wife, I could not support one; and when I could support one, I no longer needed any

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.

Laws always lose in energy what the government gains in extent.

There can be no doubt that all our knowledge begins with experience.