Moss gathers on a stone that is stationary ,but not on one that is always on the move. Similarly persons that are always changing from one occupation to another can never prosper. They only waste their time and energy get in the habits of fickleness. The result is failure in life.
On the other hand , a person who sticks to one thing in spite of difficulties is sure to succeed in the end. He may fail once or twice , or even repeatedly ,but he continues in it and profits by the experience gained. All these combine to bring him success in the end. And success in one thing gives him greater confidence and enables him to win success in other things also.