Confucius
By three methods we may learn wisdom: First, by reflection, which is noblest; Second, by imitation, which is easiest; and third by experience, which is the bitterest.
When it is obvious that the goals cannot be reached, don't adjust the goals, adjust the action steps.
It is easy to hate and it is difficult to love. This is how the whole scheme of things works. All good things are difficult to achieve; and bad things are very easy to get.
The will to win, the desire to succeed, the urge to reach your full potential. These are the keys that will unlock the door to personal excellence.
From the Son of Heaven down to the mass of the people, all must consider the cultivation of the person the root of everything besides.