At some future day it will be proved, I cannot say when and where, that the human soul is, while in earth life, already in an uninterrupted communication with those living in another world.

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

Act in such a way that you will be worthy of being happy.

From such crooked wood as that which man is made of, nothing straight can be fashioned.

The question is not so much whether there is life on Mars as whether it will continue to be possible to live on Earth

The hand is the visible part of the brain.

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