The truth is that we are all alone in the world.

It was the best of times, it was the worst of times.

The more we learn about the universe, the more we realize how much we don't know.

The world breaks everyone, and afterward, many are strong at the broken places.

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

不好的事情总是发生得很快，而几乎所有好事都发生得很慢。