This is a symbol of baptism, which now saves you-- not the putting away of the filth of the flesh, but the answer of a good conscience toward God, through the resurrection of Jesus Christ,
On the meaning of the phrase “a good conscience,” see the notes at 1 Peter 3:16 of this chapter. Compare on this verse Neander, Geschich der Pfianz. u. Leit. der chr, Kirche, i. p. 203ff, in Bibl. Reposi. iv. 272ff. It is in the highest degree probable that questions would be proposed to candidates for baptism respecting their belief, an we have an instance of this fact undoubtedly in the case before us. How extensive such examinations would be, what points would be embraced, how much reference there was to personal experience, we have, of course, no certain means of ascertaining. We may suppose, however, that the examination pertained to what constituted the essential features of the Christian religion, as distinguished from other systems, and to the cordial belief of that system by the candidate.