"The present is always invisible because it's environmental and we're fish."

All great truths begin as blasphemies.

学得越多，知道得越多。知道得越多，忘得越多。忘得越多，知道得越少。那何必学习呢？

The fountain of content must spring up in the mind, and they who have so little knowledge of human nature as to seek happiness by changing anything but their own dispositions will waste their lives in fruitless efforts.