There is no such thing as abstract art - all art is concrete in its own way.

解释：天地没有完美的功效，圣人没有完备的能力，万物没有完备的用途。

领导力意味着为了更美好的明天而在今天做出艰难的决定。

And those who were seen dancing were thought to be insane by those who could not hear the music.