enter, stranger, but take heed
of what awaits the sin of greed
for those who take, but do not earn,
must pay most dearly in their turn.
so if you seek beneath our floors
a treasure that was never yours,
thief, you have been warned, beware
of finding more than treasure there.
-- sign in front of gringott's wizard bank
harry potter and the sorcerer's stone (book i)
by j.k. rowling