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
enjakuizukunzokoukokunokokorozashiwoshiran'ya
JMdict entry #2834550
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expressions (phrases, clauses, etc.)
proverb
only a hero can understand a hero; swallows and sparrows can't understand the aspirations of phoenixes and swans
see: 燕雀鴻鵠