Our greatest glory is not in never falling, but in rising every time we fall.
Choose a job you love, and you will never have to work a day in your life.
If you think in terms of a year, plant a seed; if in terms of ten years, plant trees;
if in terms of 100 years, teach the people.
When you know a thing, to hold that you know it; and when you do not know a thing, to allow that you do not know it–this is knowledge.(知之为知之，不知为不知，是知也).
It is better to light one small candle than to curse the darkness.
Life is really simple, but we insist on making it complicated. (生活一直都很简单，但是我们也一直都忍不住要把它变得很复杂)