《孔子家语·致思》
所以，君子不能不学习，其容貌也不能不修饰，如果不加以修饰就不具有良好的举止，如果没有良好的举止，就会失去别人亲近自己的机会，失去这个机会，就失去了忠信。失去了忠信，也就失去了礼，失去了礼也便难以立足。
故君子不可以不学，其容不可以不饬。不饬无类，无类失亲，失亲不忠，不忠失礼，失礼不立。
Therefore, a gentleman cannot neglect his studies or his appearance, for if he neglects his appearance, he will lose his dignity; if he loses his dignity, he will lose the chance to make friends; and if he loses that chance, he will lose his trustworthiness. If he loses his trustworthiness, he will lose his integrity; if he loses his integrity, he will have no place to stand.