了解自己极限的唯一方法就是超越它们。

Every artist dips his brush in his own soul, and paints his own nature into his pictures.

The behaviorist cannot find consciousness in the test-tube of his science.

Entrepreneurship is an adventure, and only those who dare to take risks can reap success.

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。

自由之树需要经常用爱国者和暴君的鲜血来浇灌。