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,
There is a difference between this reference to Jesus’ sufferings and the one in 1 Peter 2:21-24. In the former case Peter used Jesus as an example of how to respond to suffering. In this case he showed that as a result of Jesus’ sufferings we can be sure of ultimate triumph, and this gives us confidence as we suffer.