후생가외가 · 후생가외를
the younger generation deserves respect, juniors may surpass their elders
Example
후생가외라더니 신입 사원의 실력이 대단해요.
They say juniors may surpass us — the new employee's skills are amazing.
Word parts
후 after+생 born+가 can+외 fear
From Confucius: those born after us deserve awe, for they may surpass us.