Purpose kindles the flame of ambition on the alter of the heart and inspires the soul to all worthy endeavor.  A presiding purpose conserves energy.  An aimless man is guilty of the worst kind of waste. … A presiding purpose not only conserves energy, but it inspires to action.  Purpose is power, motive power.  It is like a lever in mechanics.  It is like the pressure of steam in an engine.  [...]