This, I believe, is the great Western truth: that each of us is a completely unique creature and that, if we are ever to give any gift to the world, it will have to come out of our own experience and fulfillment of our own potentialities, not someone else's.
Every discovery opens a new field for investigation of facts, shows us the imperfection of our theories. It has justly been said, that the greater the circle of light, the greater the boundary of darkness by which it is surrounded.