A crow, half-dead with thirst, came upon a pitcher1 which hadonce been full of water; but when the crow put its beak2 into themouth of the pitcher he found that only very little water was leftin it, and that he could not reach far enough down to get at it. He tried, and he tried, but at last had to give up in despair. Then a thought came to him, and he took a pebble3 and dropped itinto the pitcher. Then he took another pebble and dropped it intothe pitcher. Then he took another pebble and dropped that intothe pitcher. Then he took another pebble and dropped that intothe pitcher. Then he took another pebble and dropped that intothe pitcher. Then he took another pebble and dropped that intothe pitcher. At last, at last, he saw the water mount up nearhim, and after casting in a few more pebbles4 he was able to quenchhis thirst and save his life. 
Little by little does the trick. 