The cream rises to the top; talent or ability will reveal itself even if hidden (proverb meaning a sharp tool will poke through a bag — outstanding people cannot stay hidden).
小さな会社でも優秀な社員は嚢中の錐のようにすぐ目立つ。
Even in a small company, outstanding employees stand out like a drill poking out of a bag.
彼の才能は嚢中の錐で、隠してもやがて皆に知られるだろう。
His talent will reveal itself; even if hidden, people will eventually notice him.