Paul also says, For you have died, and your life has been hidden with Christ in God, died, namely, by snuffing out your former life which was in sins, and having a new life in Christ through faith, whose depth has not yet visibly appeared to us. And Paul also explains this in other words, saying, When Christ, your life, appears, they you also will appear with him in glory. We shall be like him, he says, because when we shall enjoy with attentive regard his unchangeable and eternal divinity, we also shall be immortal and like him indeed, because we shall be happy. And yet, we shall not be like our Creator, because we are creatures. For, Who among the children of God shall be like God? Although this can also seem to be said about the immortality of the body and in this we shall indeed be like God, but only like the Son who alone among the persons of the Trinity received a body, in which he died, rose and brought it to the heavenly heights.
Many say that they have hope of the heavenly life in Christ but they make this confession ineffective by living carelessly. He who is eager to strive vigorously to perform good actions gives clear evidence in his case of his hope from on high, being convinced that no one will arrive at the likeness of God in the future except by making himself holy with the holiness of God in the present, that is, unless he imitate by rejecting wickedness and worldly desires, however, and by living soberly and righteously and faithfully. For thus are we ordered to imitate the purity of divine holiness in accord with the capacity of our nature, as we are admonished to hope for the glory of the divine likeness in accord with our own, that is, created, measure.… But he who has hope in the Lord makes himself holy, as far as he can, by striving himself and in everything requiring the grace of Him who says, Without me you can do nothing, and by saying to him, Be my helper, do not forsake me.
Venerable Bede, Commentary on 1 John 3.2–3