"The principle in water baptism (whatever mode is used) is to show leaving the old life and entering the new. Is there any way the principle can be followed without using the pattern of actual baptism? Almost all would say no. But why not erect a little closet on the church platform, have the candidate enter it in old clothes, change his clothes inside the closet, and then emerge in new clothes? Would that not illustrate the same truth as baptism does? Is it not a scriptural illustration (Col. 3:9-12)?"
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The quote is from Charles Ryrie's Basic Theology, 403.