Paul said that the Gospel is the death, burial, and resurrection of Jesus Christ (I Cor. 25:1-5). And if we are ashamed of it or if it is hidden, people will remain lost. The Gospel is Christ's doctrine, not only what He Himself preached when on Earth, but it is a doctrine concerning Him; concerning His Deity, and the self-possession of His person, and His office as a mediator, and salvation for all. And this Gospel is the only means by which we can be saved.