最危险的浪费是我们没有意识到的浪费。

广东话谚语

The beauty of mathematics is that it allows us to abstract away the complexities of the real world and focus on the underlying principles.

有谁背后没被他人议论过，又有谁在他人面前没议论过别人？有钱人不管说什么，别人都奉承他说的是真的，而穷人即使说的是真话，别人也都不相信是真话。

The secret of change is to focus all of your energy, not on fighting the old, but on building the new.

Loneliness is the starting point of thought.