数学是一门活生生的学科，不断演变和发展。

"The truth is rarely pure and never simple."

We are all prisoners of our desires, and the key to our cell is in our own hands.

In crowds it is stupidity and not mother-wit that is accumulated.

In dreams, you don't need to make any distinctions between things. Not at all. Boundaries don't exist. So in dreams there are hardly ever collisions.