在数学中，最简单的解释往往是最深刻的。

I have come to believe that a great teacher is a great artist and that there are as few as there are any other great artists. Teaching might even be the greatest of the arts since the medium is the human mind and spirit.

The only thing I'm scared of is being forgotten.

You can't change the past, but you can shape the future.

时间改变一切，绘画也不例外。