俗话说:三岁看小,七岁看老。苏洵察觉兄弟二人性格相异,为二人分别取名“轼”和“辙”。并作《名二子说》:“轮、辐、盖、轸,皆有职乎车。而轼独若无所为者。虽然,去轼,则吾未见其为完车也。轼乎,吾惧汝之不外饰也!天下之车莫不由辙。而言车之功,辙不与焉。虽然,车仆马毙,而患亦不及辙。是辙者善处乎祸福之间也。辙乎,吾知免矣!” As the saying goes: three-year-old look small, seven-year-old look old. Susu perceived brother two different personality, named for the two “Shi” and “rut”. And as “name two son said”: “wheel, spoke, cover, Zhen, Jieyouzhu car .And Shi independent nothing .Although, go to Shi, then I did not see its finished car also. , I afraid of Ru of the outer decoration also! The car of the world can not be denied. And words of car power, rut and yan. Although the car servants killed, and suffers nor bad. Also, I know, I know it! ”