The Liskov Substitution Principle is a fundamental concept in object-oriented programming, ensuring that derived classes can be used in place of their base classes without altering the correctness of the program.

There is nothing which I dread so much as a division of the republic into two great parties, each arranged under its leader, and concerting measures in opposition to each other.

臣下都不说真话，君王隐蔽的过错就多。

译文：别人不如自己的地方，不可以拿出来，在他面前卖弄；别人做不了的善事，不能因自己做过而拿出来炫耀；别人能力比不上我，不能拿来难为别人、压制别人；即使自己很有才华，也要懂得收敛起来，不要招摇，做到看起来很平凡。