To know that we know what we know, and to know that we do not know what we do not know, that is true knowledge.

Copernicus

Do you remember how electrical currents and "unseen waves" were laughed at? The knowledge about man is still in its infancy.

It gives me a deep comforting sense that "Things seen are temporal and things unseen are eternal."

The greatest discovery of my generation is that a human being can alter his life by altering his attitudes of mind.  As you think, so shall you be.

As far as we can discern, the sole purpose of existence is to kindle a light in the darkness of being.

Who looks outside, dreams; who looks inside, awakes.

. . . man will occasionally stumble over the truth, but usually manages to pick himself up, walk over or around it, and carry on.

The dissenter is every human being at those moments of his life when he resigns momentarily from the herd and thinks for himself.

You cannot do a kindness too soon, for you never know how soon it will be too late.