The point, which can hardly be repeated too often, is that differentiation is not separation. The head and the feet are different, but not separate, and though man is not connected to the universe by exactly the same physical relation as branch to tree or feet to head, he is nonetheless connected - and by physical relations of fascinating complexity.
This is the true joy of life-the being used for a purpose recognized by yourself as a mighty one, the being thoroughly worn out before you are thrown to the scrap-heap; the being a force of nature instead of a feverish, selfish clod of ailments and grievances.
I have been driven many times upon my knees by the overwhelming conviction that I had no where else to go. My own wisdom and that of all about me seemed insufficient for that day.