You've just got to get out of Yourself!

"That's the secret. He was on fire for something. He was pouring himself out, and you never lose energy and vitality in doing so. You only lose energy when life becomes dull in your mind. Your mind gets bored and therefore tired doing nothing. You don't have to be tired. Get interested in something. Get absolutely enthralled in something. Throw yourself into it with abandon. Get out of yourself. Be somebody. Do something. Don't sit around moaning about things, reading the papers, and saying: "Why don't they do something?" The man who is out doing something isn't tired. If you're not getting into good causes, no wonder you're tired. You're disintegrating. You're deteriorating. You're dying on the vine. The more you lose yourself in something bigger than yourself, the more energy you will have. You don't have time to think about yourself and get bogged down in your emotional difficulties. To live with constant energy, it is important to get your emotional faults corrected. You will never have full energy until you do so."

(From Norman Vincent Peale's The Power of Positive Thinking)