解析：天地之所以能长久存在，是因为它们的一切运作都不为自己，所以能够长久。

I’m a very positive thinker, and I think that is what helps me the most in difficult moments.

过去从未死去，它甚至还没有过去。

学习的唯一途径就是生活。

预测未来的最好方法就是创造未来。

Positive emotions are not trivial luxuries, but instead may be critical necessities for optimal functioning.

"Quantum mechanics is not just a theory, it is a framework that has fundamentally changed our understanding of reality."