燕雀安んぞ鴻鵠の志を知らんや

えんじゃくいずくんぞこうこくのこころざしをしらんやenjakuizukunzokoukokunokokorozashioshiranya

expression

1. only a hero can understand a hero
2. swallows and sparrows can't understand the aspirations of phoenixes and swans

Study it in Yanamino