No great achievement is possible without persistent work.

Our mental make-up is suited to a life of very severe physical labor

The world that we must seek is a world in which the creative spirit is alive, in which life is an adventure full of joy and hope, based rather upon the impulse to construct than upon the desire to retain what we possess or to seize what is possessed by others.

If we could all live solitary and without labor, we could all enjoy this ecstasy of independence; since we cannot, its delights are only available to madmen and dictators

It is only through labor and painful effort, by grim energy and resolute courage, that we move on to better things

The man who doesn't relax and hoot a few hoots voluntarily, now and then, is in great danger of hooting hoots and standing on his head for the edification of the pathologist and trained nurse, a little later on.