Theophylact of Bulgaria
Having said that Christians have been regenerated not of corruptible seed, but of incorruptible, by the living word of God that abides forever, the Apostle shows the nothingness and extreme frailty of human glory. By this he urges the hearer to hold more firmly to the teaching previously handed down. That teaching is constant and extends forever, while earthly things quickly decay by their very nature. To confirm this, he cites grass and the flower of grass, which is still weaker in being than the grass. David also likens our life to it (Ps 102:15). Having shown the low worth of our glory, the Apostle again returns to explain what precisely regenerated them by the word of God, living and abiding forever. He says: this is the word that was preached to you. He affirms that this word abides forever, because the Lord Himself also said: "Heaven and earth will pass away, but My words will not pass away" (Mt 24:35).