Campbell’s reply was to the point:
But who is a Christian? I answer, Every one that believes in his heart that Jesus of Nazareth is the Messiah, the son of God; repents of his sins, and obeys him in all things according to his measure of knowledge of his will. . . . t is possible for Christians to be imperfect in some respects without an absolute forfeiture of the Christian state and character.
I cannot make any one duty the standard of Christian state or character, not even immersion into the name of the Father, of the son, and of the Holy Spirit, and in my heart regard all that have been sprinkled in infancy without their own knowledge and consent, as aliens from Christ and the well-grounded hope of heaven.
There is no occasion, then, for making immersion, on a profession of the faith, absolutely essential to a Christian—though it may be greatly essential to his sanctification and comfort. My right hand and my right eye are greatly essential to my usefulness and happiness, but not to my life; and as I could not be a perfect man without them, so I cannot be a perfect Christian without a right understanding and a cordial reception of immersion in its true and scriptural meaning and design. But he who thence infers that none are Christians but the immersed, as greatly errs as he who affirms that none are alive but those of full and clear vision.