Revelation 21:1 - 5
ESV - 1 Then I saw a new heaven and a new earth, for the first heaven and the first earth had passed away, and the sea was no more. 2 And I saw the holy city, new Jerusalem, coming down out of heaven from God, prepared as a bride adorned for her husband.
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I would simply say, in order for us to prepare for heaven is we must be born again. In chapter 3 of the Gospel according to John, we find these words spoken by Jesus in the following verses: 3:3 Jesus answered and said unto him, (Nicodemus) "Verily, verily, I say unto thee. Except a man be born again, he cannot see the kingdom of God." 3:5 Jesus answered, "Verily, verily, I say unto thee, except a man be born of water and the Spirit, he cannot enter into the kingdom of God. 3:6 That which is born of the flesh is flesh; and that which is born of the Spirit is spirit. 3:7 Marvel not that I said unto thee. Ye must be born again." And finally, the Apostle Paul in 1 Corinthians 15:35-50 teaches about the resurrected body. Verse 50 says, "Now this I say, brethren, that flesh and blood cannot inherit the kingdom of God; neither doth corruption inherit incorruption."
It seems to me that the main need in preparing for heaven is dealing during one's earthly life -- both before and after placing faith in Christ -- with what C. S. Lewis called "the great sin", which is pride, viewable at https://www.homewoodcommunitychurch.org/wp-content/uploads/The-Great-Sin.pdf Even to place faith in Christ, we must first give up the idea that we are (or even can be) "good enough" in God's view to save ourselves through our own works, and therefore have no need of a Savior. After that, we must continually strive to develop a servant's heart toward others (as shown by Jesus when He washed the apostles' feet in John 13:1-17), since our entire eternal existence will be devoted to serving God and our fellow redeemed, and doing so with joy and thanksgiving.
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