一句话，先是太胆小，明知错的事却不敢不做；后来也还是太胆小，明知对的事却不敢去做。

"The only limit to our realization of tomorrow will be our doubts of today."

Work to become， not to acquire.

The truth is a slippery thing, especially in the dark.

寻找万物理论是现代物理学中最令人兴奋和最具挑战性的追求之一。