To be modest

Generally people pass from an excessive appreciation of their personal value to an equally excessive discouragement. One day they say, “I am wonderful”, and the next day, “Oh! I am good for nothing, I can do nothing.” That is like a pendulum, isn’t it? There is nothing more difficult than knowing exactly what one is; one must neither overrate oneself nor depreciate oneself, but understand one’s limits and know how to advance towards the ideal set before oneself.

Ref : Questions and Answers 1950-1951