Undeserved Suffering ~ Part 2
In my last post, we began to explore Undserved Suffering ~ Part 1 by how to witness to non-Believers in 1 Kefa 3:13-16. In this post, we conclude the topic of Undeserved Suffering ~ Part 2 in 1 Kefa 3:17-22.
17 For if God has in fact willed that you should suffer, it is better that you suffer for doing what is good than for doing what is evil. 18 For the Messiah himself died for sins, once and for all, a righteous person on behalf of non-righteous people, so that he might bring you to God. He was put to death in the flesh but brought to life by the Spirit; 19 and in this form, he went and made a proclamation to the imprisoned spirits,
On the flesh and the Spirit in verse 18, the idea is that Yeshua was resurrected by the Spirit of God, by whom also he went (presumably after the resurrection) to proclaim triumph over the imprisoned spirits. Of the many views on this text, the three main ones are (1) that between His crucifixion and resurrection, i.e. on Saturday, Yeshua preached to the dead in Sheol (the view of many church fathers); (2) that Yeshua preached through Noach to people in Noach’s day (the view of many Reformers); (3) that before or (more likely) after his resurrection, Yeshua proclaimed triumph over the fallen angels (the view of most scholars today). 
Kefa compares the Believers with Noach and his family, both being righteous minorities persecuted by wicked neighbors, and both being delivered from the forces of darkness through trusting God and obeying Him.
20 to those who were disobedient long ago, in the days of Noach, when God waited patiently during the building of the ark, in which a few people – to be specific, eight – were delivered by means of water. 21 This also prefigures what delivers us now, the water of immersion, which is not the removal of dirt from the body, but one’s pledge to keep a good conscience toward God, through the resurrection of Yeshua the Messiah. 22 He has gone into heaven and is at the right hand of God, with angels, authorities and powers subject to him. ~ 1 Kefa 3:13-22 (CJB).
Ancient Judaism sometimes used the flood as a prototype of future judgment, as in 2 Kefa 3:6–7. The emphasis on the salvation of few would encourage Believers who were a persecuted minority. God’s patience reflects Genesis 6:3 and is mentioned in connection with the final judgment in 2 Kefa 3:9.
The act of faith indicated in immersion, rather than the physical cleansing, was what was significant; immersion was an act of conversion in ancient Judaism, but Judaism insisted on the sincerity of repentance for it to be efficacious.
Authorities and powers were angelic rulers over the nations, of which Jewish texts often speak (see Eph. 1:21–23). Thus even the evil powers behind the rulers who persecuted Believers had been subdued, and the final outcome was not in question. 
In this fallen world, all people suffer. But it is better to suffer for doing good – if God wills it – than for doing evil. Again, Kefa reminds them (see 2:21-25) that Yeshua is their supreme example of Godly suffering. He suffered for sins – your sins and mine – to bring us to God (3:18). He visited the devil and his followers in the spiritual realm and proclaimed His victory over them (3:19). Then He was raised from the dead and seated at the right hand of God with angels, authorities, and powers subject to him (3:22). And if you know Yeshua, you were raised with Him (see Eph 2:6). So your present suffering doesn’t compare to the victory you have and will have, through Yeshua.
In my next post, we will learn about Being Stewards of God’s Grace in 1 Kefa 4:1-11.
 The IVP Bible Background Commentary: New Testament.