The unshakable rock is JESUS.
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When we choose Christ as our firm rock and decide to trust in Him, we are assured that He will keep us for eternity.
25 See that you do not reject Him who speaks. For if those who rejected Him who warned them on earth did not escape, much less will we if we reject Him who warns from heaven. 26 Whose voice then shook the earth, but now He has promised, saying, "Yet once, I will shake not only the earth but also heaven." 27 And this phrase, "Yet once," indicates the removal of things that can be shaken, as things that have been made, so that things that cannot be shaken may remain. 28 Therefore, since we are receiving a kingdom that cannot be shaken, let us be thankful, and through it worship God acceptably with reverence and awe; 29 for our God is a consuming fire.
Hebrews 12:25-29
I am sure that both you and I have seen on television or through some other means some news or interviews with people who have suffered some major tragedy, such as an earthquake, flood or tornado. So far, there are movies of these situations such as the one of the survivors of the plane crash in the Andes who have survived even when they lived through very adverse situations, many times these stories are too shocking.
All people are drawn to this type of news, much more if we are related or close to these people, but even in this world that is groaning and out of control, we, the children of God, have the possibility and privilege of sharing with the world some shocking news that is the best that exists, we can share that we have someone on whom we can lean and remain firm, this is a rock on which we can have our steps firm and it cannot be shaken ever, it is Jesus Christ in whom we can put our trust and we will not be disappointed at all.
35 Heaven and earth will pass away, but my words will not pass away.
Matthew 24:35
This foundation has been provided by the Almighty God himself, creator of heaven and earth. He has left all the instructions, his thoughts, his desire, his plan entirely revealed in the Bible, all of this is immutable and covers from the beginning of creation to the end of time and beyond. We can enjoy today on this earth a secure and full relationship with Our Lord Jesus Christ, at the same time we can be sure that a heavenly home is not expected for us, who place our faith and trust in Him.
2 And I John saw the holy city, new Jerusalem, coming down out of heaven from God, prepared as a bride adorned for her husband. 3 And I heard a loud voice from heaven saying, Behold, the tabernacle of God is with men, and He will dwell with them; and they shall be His people, and God Himself shall be with them, and be their God. 4 God will wipe away every tear from their eyes, and there will be no more death, neither mourning, nor crying, nor pain, for the former things have passed away.
Revelation 21:2-4