孔子说:“温习旧知识时,能有新收获,就可以做老师了。”
水的源头如果浑浊,那么水流就不可能清澈;言行不讲信用的,名声必然受到损害。
A man's life is limited, but service to the people is infinite.
To truly understand the universe, we must first understand the limits of our understanding.