Confidence isn't optimism or pessimism, and it's not a character attribute. It's the expectation of a positive outcome.

幸福和不幸取决于我们对事物的看法。

"Sometimes the greatest act of rebellion is simply to remember."

The only way to get through life is to laugh your way through it. You either have to laugh or cry. I prefer to laugh. Crying gives me a headache.

你唯一应该努力超越的人就是昨天的自己。

The only way to learn mathematics is to do mathematics.