) Hidden from the world, but revealed in the hearts of those who are enlightened by the Spirit, this doctrine becomes the measuring rod by which the saints determine whether they are faithful and true. "Examine yourselves, whether ye be in the faith; prove your own selves," Paul directs. His standard for such self-judgment is: "Know ye not your own selves, how that Jesus Christ is in you, except ye be reprobates?" (2 Cor. 13:5.)