有时候最真实的东西反而是你看不见的。
I just want to make people happy.
The true value of a forest cannot be measured in board feet alone.
You have to believe in yourself when no one else does.
解释：齐国是强国，利用它的强大进攻宋国，让他逞强，燕国就可以乘机打败齐国；齐国是大国，利用它的大国野心吞并宋国，增加土地，燕国就可以乘机进攻。