Take up one thing and do it, and see the end of it, and before you have seen the end, do not give it up. He, who can become mad with an idea, he alone sees light. . . . Take up one idea.
Make that one idea your life — think of it, dream of it, live on that idea. Let the brain, muscles, nerves, every part of your body, be full of that idea, and just leave every other idea alone. This is the way to success, and this is the way great spiritual giants are produced.