under a bushel
Matthew 5:14-16: "Ye are the light of the world. A city that is
set on an hill cannot be hid. Neither do men light a candle, and
put it under a bushel, but on a candlestick; and it giveth light
unto all that are in the house. Let your light so shine before
men, that they may see your good works, and glorify your Father
which is in heaven."