I have great assurance when I study my own conversion, when I discuss it with other men, when I look over the 25 years of my pilgrimmage with Christ; I have great assurance of having come to know Him. But even now, if I were to depart from the faith and walk away and keep going in that direction into heresy and worldiness, it could be the greatest of proofs that I never knew Him, that the whole thing was a work of the flesh.