It is not often that a man can make opportunities for himself.
 Theodore Roosevelt, Theodore Roosevelt; an Autobiography (1913). copy citation

Context

“I went around there often enough to have the men get accustomed to me and to have me get accustomed to them, so that we began to speak the same language, and so that each could begin to live down in the other's mind what Bret Harte has called "the defective moral quality of being a stranger." It is not often that a man can make opportunities for himself. But he can put himself in such shape that when or if the opportunities come he is ready to take advantage of them. This was what happened to me in connection with my experiences in Morton Hall. I soon became on good terms with a number of the ordinary "heelers"” source