Hick’s painting is based on Isaiah 11, which prophesies the coming of the Messianic Kingdom:
11:5 And righteousness shall be the girdle of his loins, and faithfulness the girdle of his reins.
11:6 The wolf also shall dwell with the lamb, and the leopard shall lie down with the kid; and the calf and the young lion and the fatling together; and a little child shall lead them.
11:7 And the cow and the bear shall feed; their young ones shall lie down together: and the lion shall eat straw like the ox.
11:8 And the sucking child shall play on the hole of the asp, and the weaned child shall put his hand on the cockatrice’ den.
11:9 They shall not hurt nor destroy in all my holy mountain: for the earth shall be full of the knowledge of the LORD, as the waters cover the sea.