There are two kinds of discontent in this world. The discontent that works, and the discontent that wrings its hands. The first gets what it wants. The second loses what it has. Theres no cure for the first, but success and theres no cure at all for the second. – Gordon Graham
I do not think that there is any other quality so essential to success of any kind as the quality of perseverance. It overcomes almost everything, even nature. – John D. Rockefeller
In antiquity the sage kings recognized that mens nature is bad and that their tendencies were not being corrected and their lawlessness controlled. – Xun Zi