Magnificent Obsession (1954)
Dr. Bob Merrick: [of a plan to do anonymous good works] Well, if it's as simple as all that, why, I'll certainly give it a chance.
Edward Randolph: Now wait, Merrick! Don't try to use this unless you're ready for it! You can't just try this out for a week like a new car, you know! And if you think you can feather your own nest with it, just forget it. Besides, this is dangerous stuff. One of the first men who used it went to the Cross at the age of thirty-three...
Edward Randolph: Once you find the way, you'll be bound. It will obsess you. but believe me, it will be a magnificent obsession.