Not long ago, it seemed to me that my world had gone dark and that it would never grow completely light again. In perhaps the darkest hour, I flung myself down upon the ground close to the bank of a stream. And then, close over my head--so close I could have tossed a pebble to it--a warbler near burst its little throat in song. And the miracle of it was that it was a dark and sunless day. But the warbler sang, and then he chirped in the boughs above; and when I looked at the ground beside me again, I saw there, peeping up at me out of the grass, a single violet. And the bird and the violet gave me more courage and cleared my world for me more than all the human friends who had told me they were sorry. The violet said, “I am still here; you will never lose me,” and the little warbler said, “I will always sing--through all the years you live.” And stronger than ever came the faith in me that these things were no more an accident of creation than man himself. Once I saw this Great Doctor of mine a burning, vibrant force in a room of a crowded tenement, from the roof of which one could not see a blade of grass or a tree. In fact, that force filled three rooms, in which lived a man and woman and five children. I spent an hour in those rooms on a Sunday afternoon, and the experience of that hour in a hot and crowded tenement was a mightier sermon than was ever preached to me in the heart of a forest. At every window was a box in which green stuff was growing. There were flowers in pots. A pair of canary-birds looked down upon the smoky roofs of a great city and sang. What interested me most was two contrivances the man had made to force oats into swift germination and growth. In a week, he told me, the green sprout of an oat would be two inches long. Then I saw why they were grown. Several times while I was there would a dove come to a window and wait for a bit of the green. I could see they were different doves. They told me at least a dozen were accustomed to come in that way. They were the children’s pets. A little baby in arms cooed at them and waved his arms in delight. I have seen many poor tenement families, but that, I think, was the only happy one. The singing of the birds, the coming of the doves, the growing of green things in their room were their inspiration, their hope, the promise of dreams that would some day come true. Nature had become their religion, and yet they did not know it as such. It was calling them out into the great open spaces--and they were living in anticipation of that day when they would answer the call.