穷则独善其身,达则兼济天下

A. You might as well not read if you fully believe in the ideas from the book you read and blindly follow all practices in the book.
B. Nothing can be accomplished without norms or standards.
C. Favorable weather is less important than advantageous terrain, and advantageous terrain is less important than unity among the people.
D. When in poverty, improve yourself; when in success, improve the world.