世界是生者的地方，死者在其中没有位置。死者什么都不是。
The world is a place of the living, and the dead have no place in it. The dead are nothing.
The greatest teacher is called “doing”.
Actual great opportunities do not have “Great Opportunities” in the subject line.
译文：借鉴前代兴衰，考察当下得失。《通鉴》的写作宗旨，直指现实关怀。