《庄子·外篇·至乐》
如此说来，就应当看作是禀受天命而形成形体，形体虽异却各有适宜的用处，全都是不可以随意添减改变的。
夫若是者，以为命有所成而形有所适也，夫不可损益。
In this way, it should be regarded as a gift from heaven, and although the shapes are different, each of them has its own uses, and all of them cannot be easily changed.