The most necessary, the most important, the principal, the most essential thing for a musician is this: to know what he wants, what he can do, and what he ought to do.

释义：麝香因为香气浓郁而提前丧命，蚕因为吐丝过多而早早死亡。一剂养神平胃散，两盅和气二陈汤，这些都能帮助我们调养身体，保持健康。