For it is better to suffer for doing good, if that should be God’s will, than for doing evil.
17 For it is better This belongs not only to what follows but to the whole context. He had spoken of the profession of faith, which at that time was attended with great danger; he says now that it is much better, if they sustained any loss in defending a good cause, to suffer thus unjustly than to be punished for their evil deeds.
The confession of a Christian's faith cannot credibly be supported but by the two means here specified - a good conscience and a good conversation. conscience is good when it does its office well, when it is kept pure and uncorrupt, and clear from guilt; then it will justify you, though men accuse you.
Commenting on 1 Peter 3:16-17
For Christ also hath once suffered for sins,.... Not his own, for he committed none, but for the sins of his people; in order to obtain the remission of them, to make reconciliation for them, and to take and put them away, and finish and make an end of them; which sufferings of his, on account of them, were many and great: he suffered much...