A Crow, half-dead with thirst, came upon a Pitcher which had once been
full of water; but when the Crow put its beak into the mouth of the
Pitcher he found that only very little water was left in 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 pebble and dropped it into the Pitcher. Then he took
another pebble and dropped it into the Pitcher. Then he took another
pebble and dropped that into the Pitcher. Then he took another pebble
and dropped that into the Pitcher. Then he took another pebble and
dropped that into the Pitcher. Then he took another pebble and dropped
that into the Pitcher. At last, at last, he saw the water mount up near
him, and after casting in a few more pebbles he was able to quench his
thirst and save his life.
Little by little does the trick.