【译文】暮春三月,穿上春天的衣服,约上五六人,带上六七个童子,在沂水边沐浴,在高坡上吹风,一路唱着歌而回

Happiness requires both pleasure and purpose - neither alone is sufficient.

I'm not going to keep on knocking that old door that doesn't open for me. I'm going to create my own door and walk through that.

人生苦短，必须快乐

圆的周长大于任何内接等边多边形的周长，小于任何外切多边形的周长。