Two painters were once asked to paint a picture illustrating their own ideas of rest. The first chose for his scene a quiet, lonely lake, nestled among mountains far away. The second, using swift, broad strokes on his canvas, painted a thundering water fall. Beneath the falls grew a fragile birch tree, bending over the foam. On its branches, nearly wet with the spray from the falls, sat a robin on its nest. The first painting was simply a picture of stagnation and inactivity. The second, however, depicted rest.