There is a limit where the intellect fails and breaks down, and this limit is where the questions concerning God and freewill and immortality arise.

I assert that, in any particular natural science, one encounters genuine scientific substance only to the extent that mathematics is present.

The inscrutable wisdom through which we exist is not less worthy of veneration in respect to what it denies us than in respect to what it has granted.

Art does not want the representation of a beautiful thing, but the representation of something beautiful.

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

Every man is to be respected as an absolute end in himself; and it is a crime against the dignity that belongs to him as a human being, to use him as a mere means for some external purpose.

. . . as to moral feeling, this supposed special sense, the appeal to it is indeed superficial when those who cannot think believe that feeling will help them out, even in what concerns general laws: and besides, feelings which naturally differ infinitely in degree cannot furnish a uniform standard of good and evil, nor has any one a right to form judgments for others by his own feelings. . . .