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

我并不假装理解宇宙——它比我大多了。

知道我们所知道的，知道我们所不知道的，这才是真正的知识。

A dreamer is one who can only find his way by moonlight, and his punishment is that he sees the dawn before the rest of the world.