“This, I suppose, constitutes one of the greatest dangers of retiring, the sudden cutting off of motive power while the mechanism is still running at top speed. It would be so much better and easier, if it were possible, to cut off the motive power gradually; in other words to retire by slow and easy stages, instead of being in full production one day, crying "Come on! Come on!" and turning aimlessly around the next still saying "Come on!" but for no reason.”