1 Peter 4:12,13 - Joseph Benson’s Commentary on the Old and New Testaments

Think it not strange, &c. Wonder not at the fiery trial The dreadful series of furious and bitter persecutions. The original expression, εν υμιν πυρωσει, is literally, the burning which is among you; denoting the grievous persecution which the Christians in Pontus, &c., were suffering for their faith; including both martyrdom itself, which frequently was by fire, and all the other sufferings joined with or previous to it. The metaphor is bold, but noble: it expresses in a lively manner the painful and dangerous nature of their trials. Which is to try you Is permitted by the wisdom of God for the trial of your faith in Christ, and in the truths and promises of his gospel; of your hope of eternal life, your love to God, his people, and his ways, of your resignation to his will, your patience and meekness; as though some strange thing happened unto you Different from, or beyond, all which you were taught to expect. But rejoice in these trials, inasmuch as ye are therein partakers of Christ's sufferings Sufferings endured for his sake, in defence of his truth, and in proof of your faith in him; that when his glory shall be revealed At the great and glorious day of his second appearance; ye In the participation of it; may be glad with exceeding joy Χαρητε αγαλλιωμενοι, may rejoice transported with gladness.