《论衡·卷二十六·知实篇》
如果说 实际上已经知道，还应当再问，以此给人做榜样 ，那么孔子通晓 五经 ，学生们跟他学习，他也应该再去请教一下别人，以此来给人做榜样，为什么孔子只是给学生讲课而不请教别人呢？
实已知，当复问，为人法。孔子知《五经》，门人从之学，当复行问，以为人法，何故专口授弟子乎？
If it is said that if you actually know, you should still ask and set an example for others, then Confucius is well versed in the Five Classics. Students learn from him, and he should also ask others for advice to set an example for others. Why does Confucius only teach students but not ask others for advice?