Calvin on 1 Peter 1:11:
The order is to be noticed; he mentions sufferings first, and then adds the glories which are to follow. For he intimates that this order cannot be changed or subverted; afflictions must precede glory. So there is to be understood a twofold truth in these words, — that Christians must suffer many troubles before they enjoy glory, — and that afflictions are not evils, because they have glory annexed to them. Since God has ordained this connection, it does not behove us to separate the one from the other. And it is no common consolation, that our condition, such as we find it to be, has been foretold so many ages ago.
Hence we learn, that it is not in vain that a happy end is promised to us; secondly, we hence know that we are not afflicted by chance, but through the infallible providence of God; and lastly, that prophecies are like mirrors to set forth to us in tribulations the image of celestial glory.