【译文】 孔子说：“年轻人值得敬佩，怎知后代不如今人？四五十岁还默默无闻的人，就没什么前程了。”

I am not wise, but I have learned a great deal simply by staying alive.

The best way to learn mathematics is to do mathematics.

I like everything that has no style: dictionaries, photographs, nature, myself and my paintings.

思想的自由是最珍贵的自由。