Christians should live in the world, but not be filled with it. A ship lives in the water; but if the water gets into the ship, she goes to the bottom. So Christians may live in the world; but if the world gets into them, they sink.

--Dwight L. Moody (February 5, 1837 – December 22, 1899, American Evangelist, publisher who founded Moody Church, Northfield School, Mount Hermon School, and the Moody Bible Institute).