At an evangelistic meeting of the famous preacher, Dwight L. Moody, a young man stood up and said "I am not quite sure -- but I will trust, and I will obey." Nobody knows who that young man was, but his words stuck with Moody's songleader, who wrote them down and shared them with a friend. Together, they wrote this enduring hymn, encouraging millions for the past 130+ years to trust, and to obey.