One day, however, about mid-afternoon, he picked up a pebble and it was warm. He threw it into the sea before he realized what he had done. He had formed such a strong habit of throwing each pebble into the sea that when the one he wanted came along, he still threw it away.
So it is with opportunity. Unless we are vigilant, it's easy to fail to recognize an opportunity when it is in hand and it's just as easy to throw it away.