What can last forever?

Man is mortal. Sooner or later, man dies. Whatever he has earned, he has achieved is no more for him. For this reason, man longs for immortality in order to continue to possess. Some men are more pragmatic. They only want to leave behind a legacy such as a magnifcient building or a philosophical system, which may or may not last forever. But what can last forever?

The Bible uses another phrase: "stands/abides forever". A search through the Bible yields the following items which can last forever: the word of God (Isaiah 40:8, 1 Peter 1:25), the counsel of God (Psalm 33:11), the throne of David (Psalm 89:37), Zion (Psalm 125:1) and the Kingdom of God (Daniel 2:44). Since we are reading the First Epistle of Peter, we will take a look at the word of God.

God created the heavens and the earth with His word (Genesis 1). But the heavens and the earth will pass away one day. Therefore, the heavens and the earth do not guarantee the transcendence of the word of God. For the Israelites, the word of God comes in the form of the law. Jesus once made the following remark about the law.
For truly, I say to you, till heaven and earth pass away, not an iota, not a dot, will pass from the law until all is accomplished (Matthew 5:18).
The phrase "until all is accomplished" suggests an end to the law. When all is accomplished, the law is no longer needed. The law will also end one day.
So, why do Jews and Christians have so much confidence in the word of God such that it abides forever? None of them has yet lived forever. Superficially, it can be "proved" logically. The reasoning goes like this. God is eternal. Therefore, God's word is also eternal. God's creation may not be eternal. But God's word is not God's creation. Therefore, God's word is eternal.
The whole reasoning hinges on God Himself. Therefore, I think it is an act of faith to insist that the word of God lasts forever. I am afraid we will never be able to find any convincing empirical evidence to verify or to falsify it. Likewise, we can't prove or disprove the existence of God, though philosophers and theologians have demonstrated their proofs.

Return to Peter. For him, the gospel of Jesus is the word of God. Christians have been born anew through their faith in the risen Jesus. This entails leading a life of holiness. But Peter does not mean the holiness of keeping the commandments of God. Rather, it is a life of charity.
Having purified your souls by your obedience to the truth for a sincere love of the brethren, love one another earnestly from the heart (1 Peter 1:22).
The holiness of Christian life is demonstrated through charity.

Dear Lord, may we pass on Your love so as to partake in Your eternal life. Amen.

Appendix:
πᾶσα σὰρξ ὡς χόρτος καὶ πᾶσα δό ξα αὐτῆς ὡς ἄνθος χόρτου· ἐξηράνθη ὁ χόρτος καὶ τὸ ἄνθος ἐξ έπεσεν·
τὸ δὲ ῥῆμα κυρίου μένει εἰς τὸν αἰῶνα.
All flesh is like grass and all its glory like the flower of grass. The grass withers, and the flower falls,
but the word of the Lord abides for ever (1 Peter 1:24-25a, RSV).
Πᾶσα σὰρξ χόρτος, καὶ πᾶσα δόξα ἀνθρώπου ὡς ἄνθος χόρτου,
ἐξηράνθη ὁ χόρτος, καὶ τὸ ἄν θος ἐξέπεσεν,
τὸ δὲ ῥῆμα τοῦ θεοῦ ἡμῶν μένει εἰς τὸν αἰῶνα(Isaiah 40:6b-7).