1 Peter 1:4 - Matthew Poole's English Annotations on the Holy Bible

To an inheritance; so eternal life is called, Ephesians 1:18, and elsewhere, as being given not as wages to hirelings, but as an inheritance to children born of God, and adopted to him. Incorruptible; immortal, everlasting, which being once possessed, cannot be taken away, nor pass over to others. And undefiled; both as being pure in itself, and having nothing to offend them that enjoy it; and likewise as being incapable of any pollution or defilement, contrary to what is said of the land of Canaan, the earthly inheritance of the Israelites, Jeremiah 2:7 Ezekiel 36:17. And that fadeth not away; always retains its vigour and gratefulness, never causes weariness or satiety in them that possess it. It seems to be a metaphor taken from flowers, probably the amaranthus, (the very word here used), which still keeps its freshness and verdure, without any decay or withering. Reserved; laid up, Colossians 1:5 2 Timothy 4:8; secured for the heirs, though not yet possessed by them. In heaven; and therefore safe, and out of the reach of enemies. This is opposed to the uncertain condition of earthly possessions, such as Canaan was. For you; margin, for us, viz. whom God hath begotten again: or if we read it, as in the text, for you, the apostle may change the person in order to his exhortation.