Bertrand Russell Quotes（バートランド・ラッセルの名言・警句)

　

The man who underestimates himself is perpetually being surprised by success, whereas the man who overestimates himself is just as often surprised by failure. The former kind of surprise is pleasant, the latter unpleasant. It is therefore wise to be not unduly conceited, though also not too modest to be enterprising.
　Source: The Conquest of Happiness, 1930, chap.10:Is Happiness still possible?
　More info.:http://russell-j.com/beginner/HA21-010.HTM