《孟子·告子章句上·第五节》
孟季子听了这些话后，说： 在这种情况下尊敬叔父，在那种情况下尊敬弟弟，这毕竟是外在情况决定的，并不是由内心发出的。 
季子闻之曰： 敬叔父则敬，敬弟则敬，果在外，非由内也。 
After hearing these words, Meng Jizi said: to respect our uncles under such and such circumstances, and to respect our younger brothers under such and such circumstances, after all is determined by external circumstances, and not motivated by our inner selves.