Adam Clarke on 1 Peter 3:13

Who is he that will harm you - Is it possible that a man can be wretched who has God for his friend? "All the devices which the devil or wicked men work against such must be brought to naught, and by the providence of his goodness be dispersed."

If ye be followers, etc. - Εαν Του Αγαθου μιμηται γενησθε· If ye be imitators of the good One, i.e. of God. Ὁ Αγαθος, the good One, is one of God's prime epithets, see Mat 19:17, and Satan is distinguished by the reverse, ὁ πονηρος, the Evil one, Mat 13:19 (note). Instead of μιμηται, followers, or rather imitators, ζηλωται, zealous of what is good, is the reading of ABC, fifteen others, both the Syriac, Erpen's Arabic, the Coptic, Ethiopic, Armenian and Vulgate, with some of the fathers. This is a very probable reading, and Griesbach has placed it in the margin as a candidate for the place of that in the text.