In the end, we only regret the chances we didn't take.
追求数学真理是一场永无止境的冒险。
The truth is always something that is told, not something that is known.
在生活的洪流中,没有人是毫无烦恼的。
You get towards the end of life—no, not life itself, but of something else: the end of any likelihood of change in that life.