Truth is a free creation of the human spirit, that never would exist at all if we did not generate it ourselves.
学习数学的最好方法就是做数学。
The world is full of people who have never, since childhood, met an open doorway with an open heart.
这个世界上充满了自童年以来从未以开放的心态迎接开放之门的人。
I think I'm just an ordinary person who learned a bit of music.