The chief condition on which, life, health and vigor depend on, is action. It is by action that an organism develops its faculties, increases its energy, and attains the fulfillment of its destiny. ↗
The chess player who develops the ability to play two dozen boards at a time will benefit from learning to compress his or her analysis into less time. ↗
Nearly every man who develops an idea works it up to the point where it looks impossible, and then he gets discouraged. That's not the place to become discouraged. ↗