The spirited horse, which will try to win the race of its own accord, will run even faster if encouraged. – Ovid

I believe that any mans life will be filled with constant and unexpected encouragement, if he makes up his mind to do his level best each day, and as nearly as possible reaching the high water mark of pure and useful living. – Booker T. Washington

Note how good you feel after you have encouraged someone else. No other argument is necessary to suggest that never miss the opportunity to give encouragement. – George M. Adams