You are as young as your faith, as old as your doubt, as young as your self-confidence, as old as your fear, as young as your hope, as old as your despair. So long as your heart receives messages of beauty, cheer, courage, grandeur and power from the earth, from man and from the infinite, so long are you young. When the wires are all down and all the central place of your heart is covered with the snows of pessimism and the ice of cynicism, then you are grown old indeed and may God have mercy on your soul.