An organized product of nature is that in which all the parts are mutually ends and means.

Human beings are never to be treated as a means but always as ends.

Do the right thing because it is right.

Act that your principle of action might safely be made a law for the whole world.

I feel a complete thirst for knowledge and an eager unrest to go further in it as well as satisfaction at every acquisition. There was a time when I believed that this alone could constitute the honor of mankind, and I had contempt for the ignorant rabble who know nothing.

[A ruler is merely] the trustee of the rights of other men and he must always stand in dread of having in some way violated these rights.

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.