Science is not just about facts, but about understanding the underlying principles that govern those facts.

人类不仅是自然的产物，也是自然的改造者，常常带来不可逆转的后果。

The melancholy science from which I make this offering to my friend relates to a region that from time immemorial was regarded as the true field of philosophy, but which, since the latter's conversion into method, has lapsed into intellectual neglect, sententious whimsy, and finally oblivion.

Optimism is not just a trait; it's a skill that can be cultivated.