《晋书·列传·第十六章》
而帝王的制度，国君设立太子用嫡子而不是按年龄大小，设立嫡子用年长的而不是按他们贤能的程度，造是不能改变的。
而王制，人君立子以嫡不以长，立嫡以长不以贤，此事情之不可易者也。
And the system of the emperor, the sovereign establishes the prince to use the legitimate son rather than according to age, establishes the legitimate son to use the elder rather than according to their degree of virtuous capability, this creation cannot be changed.