Only When The Sun Shines Brightly

One of Aesop's Fables tells the story of a wager between the sun and the wind to see which can succeed in removing a traveller's heavy coat. The wind tries first, but however hard it blows it fails to make any progress because the traveller simply buttons his coat even tighter than before. Only when the sun shines brightly does he finally remove it, and the wind roars away in a bad temper.