"I am made all things to all men, that I might by all means save some.” (1 Corinthians 9:22)
It is a grand thing to see a man thoroughly possessed with one master-passion. Such a man is sure to be strong, and if the master-principle be excellent, he is sure to be excellent, too. The man of one object is a man indeed. Lives with many aims are like water trickling through innumerable streams, none of which are wide enough or deep enough to float the merest cockleshell of a boat; but a life with one object is like a mighty river flowing between its banks, bearing to the ocean a multitude of ships, and spreading fertility on either side. Give me a man not only with a great object in his soul, but thoroughly possessed by it, his powers all concentrated, and himself on fire with vehement zeal for his supreme object, and you have put before me one of the greatest sources of power which the world can produce. Give me a man engrossed with holy love as to his heart, and filled with some masterly celestial thought as to his brain, and such a man will be known wherever his lot may be cast, and I venture to prophesy that his name will be remembered long after the place of his sepulcher shall be forgotten.
Spurgeon, Charles H (2012-03-27). The Soul Winner (Kindle Locations 2591-2600). Counted Faithful. Kindle Edition.