The first resurrection
Rev 20:4-6 Then I saw thrones, and seated on them were those to whom the authority to judge was committed. Also I saw the souls of those who had been beheaded for the testimony of Jesus and for the word of God, and those who had not worshiped the beast or its image and had not received its mark on their foreheads or their hands. They came to life and reigned with Christ for a thousand years. The rest of the dead did not come to life until the thousand years were ended. This is the first resurrection. Blessed and holy is the one who shares in the first resurrection! Over such the second death has no power, but they will be priests of God and of Christ, and they will reign with him for a thousand years.
1Thess 4:13-17 But we do not want you to be uninformed, brothers, about those who are asleep, that you may not grieve as others do who have no hope. For since we believe that Jesus died and rose again, even so, through Jesus, God will bring with him those who have fallen asleep. For this we declare to you by a word from the Lord, that we who are alive, who are left until the coming of the Lord, will not precede those who have fallen asleep. For the Lord himself will descend from heaven with a cry of command, with the voice of an archangel, and with the sound of the trumpet of God. And the dead in Christ will rise first. Then we who are alive, who are left, will be caught up together with them in the clouds to meet the Lord in the air, and so we will always be with the Lord.
Matt 22:30 For in the resurrection they neither marry nor are given in marriage, but are like angels in heaven.
Luke 14:14 and you will be blessed, because they cannot repay you. For you will be repaid at the resurrection of the just.”
Luke 20:35-36 but those who are considered worthy to attain to that age and to the resurrection from the dead neither marry nor are given in marriage, for they cannot die anymore, because they are equal to angels and are sons of God, being sons of the resurrection.
John 6:39 And this is the will of him who sent me, that I should lose nothing of all that he has given me, but raise it up on the last day.
John 6:40 For this is the will of my Father, that everyone who looks on the Son and believes in him should have eternal life, and I will raise him up on the last day.”
John 6:44 No one can come to me unless the Father who sent me draws him. And I will raise him up on the last day.
John 6:54 Whoever feeds on my flesh and drinks my blood has eternal life, and I will raise him up on the last day.
John 11:24-26 Martha said to him, “I know that he will rise again in the resurrection on the last day.” Jesus said to her, “I am the resurrection and the life. Whoever believes in me, though he die, yet shall he live”. Jesus said to her, “I am the resurrection and the life. Whoever believes in me, though he die, yet shall he live, and everyone who lives and believes in me shall never die. Do you believe this?”
1Cor 15:42 So is it with the resurrection of the dead. What is sown is perishable; what is raised is imperishable. - KJV
1Cor 15:43-49 It is sown in dishonor; it is raised in glory. It is sown in weakness; it is raised in power. It is sown a natural body; it is raised a spiritual body. If there is a natural body, there is also a spiritual body. Thus it is written, “The first man Adam became a living being”; the last Adam became a life-giving spirit. But it is not the spiritual that is first but the natural, and then the spiritual. The first man was from the earth, a man of dust; the second man is from heaven. As was the man of dust, so also are those who are of the dust, and as is the man of heaven, so also are those who are of heaven. Just as we have borne the image of the man of dust, we shall also bear the image of the man of heaven.
1Cor 15:50-57 Now this I say, brethren, that flesh and blood cannot inherit the kingdom of God; neither doth corruption inherit incorruption. Behold, I shew you a mystery; We shall not all sleep, but we shall all be changed, In a moment, in the twinkling of an eye, at the last trump: for the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed. For this corruptible must put on incorruption, and this mortal must put on immortality. So when this corruptible shall have put on incorruption, and this mortal shall have put on immortality, then shall be brought to pass the saying that is written, Death is swallowed up in victory. O death, where is thy sting? O grave, where is thy victory? The sting of death is sin; and the strength of sin is the law. But thanks be to God, which giveth us the victory through our Lord Jesus Christ. – KJV
The second resurrection
Rev 20:11-14 Then I saw a great white throne and him who was seated on it. From his presence earth and sky fled away, and no place was found for them. And I saw the dead, great and small, standing before the throne, and books were opened. Then another book was opened, which is the book of life. And the dead were judged by what was written in the books, according to what they had done. And the sea gave up the dead who were in it, Death and Hades gave up the dead who were in them, and they were judged, each one of them, according to what they had done. Then Death and Hades were thrown into the lake of fire. This is the second death, the lake of fire. And if anyone's name was not found written in the book of life, he was thrown into the lake of fire.
Referencing both resurrections
John 5:28-29 Do not marvel at this, for an hour is coming when all who are in the tombs will hear his voice and come out, those who have done good to the resurrection of life, and those who have done evil to the resurrection of judgment.
Acts 24:15 having a hope in God, which these men themselves accept, that there will be a resurrection of both the just and the unjust.
Rev 20:4-6 Then I saw thrones, and seated on them were those to whom the authority to judge was committed. Also, I saw the souls of those who had been beheaded for the testimony of Jesus and for the word of God, and those who had not worshiped the beast or its image and had not received its mark on their foreheads or their hands. They came to life and reigned with Christ for a thousand years. The rest of the dead did not come to life until the thousand years were ended. This is the first resurrection. Blessed and holy is the one who shares in the first resurrection! Over such the second death has no power, but they will be priests of God and of Christ, and they will reign with him for a thousand years.
My thoughts on the resurrection IMO
There are only two resurrections, the resurrection of the righteous to everlasting life and the resurrection of the unrighteous to judgment as can be seen from the verses quoted above. The righteous who really believe in Christ Jesus and bear the fruits motivated by that belief, along with their faith and obedience, are resurrected to everlasting life and are given the gift of immortality and incorruptibility to rule with Christ as kings and priests for 1000 years.
As for the resurrection of the unrighteous ‘another book was opened, which is the book of life. And the dead were judged by what was written in the books, according to what they had done. And if anyone's name was not found written in the book of life, he was thrown into the lake of fire.’
Considering that the dead are judged by what is written in the ‘book of life’ and other books, there must be those who are judged worthy of life at this time.
Rev 21-22 goes on to describe what happens after that, as a ‘new heaven an new earth’ in which the ‘New Jerusalem’ descends upon the earth and the “dwelling place of God is with man. He will dwell with them, and they will be his people, and God himself will be with them as their God.” For this to happen there must be humans on earth, those who are resurrected and judged worthy of life.
Rev 21:4-7 He will wipe away every tear from their eyes, and death shall be no more, neither shall there be mourning, nor crying, nor pain anymore, for the former things have passed away.” And he who was seated on the throne said, “Behold, I am making all things new.” Also, he said, “Write this down, for these words are trustworthy and true.” And he said to me, “It is done! I am the Alpha and the Omega, the beginning, and the end. To the thirsty I will give from the spring of the water of life without payment. The one who conquers will have this heritage, and I will be his God and he will be my son.
Rev 22:1 Then the angel showed me the river of the water of life, bright as crystal, flowing from the throne of God and of the Lamb through the middle of the street of the city; also, on either side of the river, the tree of life with its twelve kinds of fruit, yielding its fruit each month. The leaves of the tree were for the healing of the nations. No longer will there be anything accursed, but the throne of God and of the Lamb will be in it, and his servants will worship him. They will see his face, and his name will be on their foreheads. And night will be no more. They will need no light of lamp or sun, for the Lord God will be their light, and they will reign forever and ever.
As Rev 22 not only shows the waters of life but also the tree or trees of life that will be available to heal the nations as it did and would have done for Adam and Eve for them to continue living everlastingly.
Yes, I believe life everlasting will still be conditional for humans then just as it was for Adam and Eve! (Refer to my first posting regarding the tree of life). Why? Just like Adam and Eve, these ones can still become disobedient even at that time as is noted by these scriptures:
Rev 21:8 But as for the cowardly, the faithless, the detestable, as for murderers, the sexually immoral, sorcerers, idolaters, and all liars, their portion will be in the lake that burns with fire and sulfur, which is the second death.”
Rev 21:27 But nothing unclean will ever enter it, nor anyone who does what is detestable or false, but only those who are written in the Lamb's book of life.
Rev 22:14-15 Blessed are those who wash their robes, so that they may have the right to the tree of life and that they may enter the city by the gates. Outside are the dogs and sorcerers and the sexually immoral and murderers and idolaters, and everyone who loves and practices falsehood.
Bad humans at that time will be cut off from access to the city New Jerusalem and therefore to the waters of life and the tree of life, just like Adam and Eve were barred from the Garden of Eden and access to the “Tree of Life” as that time and eventually died. It appears though from Rev 21:8 that if you die at that time, you are dead forever.