始终保持你的刀锋利,你的智慧更锋利,你的精神最锋利。
The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.
"We are all prisoners of our own memories, and the past is a jail from which we can never escape."
"The world is a book, and those who do not travel read only a page."