What do you think a musical instrument what lesson the speaker has tried to reach the reader

On one level, one might interpret this stanza as pointing to the hypocrisy and duality of human nature. Humans have the ability to do great things, but many times people have little regard for the cost of arriving at those achievements. Pan justifies his behavior by praising his flute, while some might say that the music was produced at the cost of nature or even an innocent being (Syrinx). There may be beauty present, but there is also pain and destruction.