“There is one glory of the sun, another glory of the moon, and another glory of the stars; for star differs from star in glory. So also is the resurrection of the dead.” - 1 Corinthians 15:41–42
Paul here speaks of different bodies or "bodies", the sun is different from the moon, each star has its own unique twinkle, its own glory different from the others, and different from the sun or the moon. In the same way the present body--mortal, corruptible, etc--is different from the body in the resurrection (immortal, incorruptible, etc). While this body dies and decays, when it is raised up it is glorified and made immortal and incorruptible; "sown in dishonor, raised in honor". So the glory of this present body and the glory of the body in the resurrection are different--we should not imagine that the future risen body will just be like this one, it has a distinct glory--mortal vs immortal, corruptible vs incorruptible, dishonor vs honor, etc.
One may ask exactly how we might look in the resurrection, what about those who had missing limbs? Or those who died as small children, will they still be small children in the resurrection? I think Paul would answer and tell us that in some sense we're missing the point. The bodily existence in the resurrection will be radically different than our current bodily experiences. We cannot look at our current bodily experience and attempt to read that into the future. Though we can know that it is the body--for Christ rose from the dead, the first fruits of the resurrection of the dead.
Luke 19:17
“Well done, good servant; because you have been faithful in a very little, you shall have authority over ten cities.”
This is part of a parable, where the faithful servant having been faithful with little, is given more. When we reach the end of our mortal days and stand before the Lord, how we lived with what what we had--our circumstances, the gifts we had, the people God brought into our lives, etc--how did we live? Were we faithful with what we had? Were you faithful as a parent? As a son or daughter? As a spouse? As a neighbor? Were you kind and welcoming to the stranger? If you were an employer were you just and fair to your employees? The good and faithful servant was faithful with the little they had, and so much more is given them. It's not about having authority in the future world, but rather that the faithful servant has done well with what they were given.
Matthew 5:19
“Whoever does and teaches them, he shall be called great in the kingdom of heaven.”
In contrast to those who tell others to not bother with the commandments, for if one is lax in even the least commandment he shall be called least in the kingdom. Ultimately the point Jesus is making is found in the following verse, "If your righteousness does not exceed that of the Scribes and Pharisees, you will never enter the kingdom". This requires a bit of unpacking, this is about the hypocrisy of those who claim to follow the Law; they claim to observe God's commandments but fail in the small things, they brag about how they tithe but fail to care for the elderly, they fail to show mercy. God isn't interested in religious showmanship, He wants sincere worshipers. It's not those who want everyone to think they are holy who are holy, it's those who do good in the dark of night, it's not the one who prays loudly in public for attention, but the one who goes into the closet and cries out to God, it is not the one who is wealthy publicly donating a large donation to the Temple, but the poor widow who gives her last coin.
In God's kingdom, that is to say, in the way that God is King, it isn't the hypocrites who want everyone to praise them for being devout who are called great, it's the tiny unimportant people who are sincere in their faithfulness, not calling attention to themselves, but simply and faithfully obeying God in the tiny little ways of their life. The one who snubs the homeless person and refuses to show compassion to the weak will be called least; but the one who is faithful to God's command--to love our neighbor, to show kindness even to the unthankful, to forgive those who hate us, etc--that is greatness in God's kingdom.
The way God is King--that's what Kingdom of God/Heaven means--is not like the way kings act here on earth; His Kingdom, His Kingship is found in the Meek Carpenter from Galilee who suffers--Jesus shows us the Kingdom. Jesus is the King.
1 Corinthians 7:38
“So he who marries his fiancée does well, but he who refrains from marriage will do even better.”
St. Paul argues that he believes it preferable (but it is not a commandment) to remain unmarried in this life; because being married means certain obligations--the one who gets married has obligations toward spouse and (almost certainly) children. Whereas the unmarried can focus on other things. Paul is clear that he does not regard celibacy to be a commandment; but he offers his opinion that celibacy is preferable to marriage. It's simply a matter of how and where one's energies are put. If I am unmarried, I could drop everything and go be a missionary somewhere if that was my calling (e.g.) but if I am married then my obligation is to my wife and kids, I can't just uproot myself that would be selfish and wrong. I owe my wife my time, my love, my energy--because I have made a sacred obligation and commitment to her and to our family. For Paul, who chose celibacy, he believed it was the best choice; but he does not dare command anyone refuse to marry, and indeed it is good to marry if you have promised to marry someone--marriage is good and blessed and holy.
Matthew 19:12
“There are eunuchs who have made themselves eunuchs for the sake of the kingdom of heaven. Let the one who is able to receive this receive it.”
Similar to the above, those who commit themselves to lives of celibacy and chastity choose a good calling. Those who can, do so; but not everyone is called to celibacy and chastity. Both the celibate life and the married life are holy and valid life vocations.
Revelation 14:4
“These are the ones who have not defiled themselves with women, for they are virgins… These follow the Lamb wherever he goes.”
what do all these verses mean?
There are a lot of interpretations of the 144,000. I tend toward the view that this refers to the collective whole of the Faithful of all places and times. And they are called undefiled and virgin because they are pure from the world. Not that they are literally virgins. The Church is called out from the world--Ekklesia--to be faithful to her one Lord Jesus Christ.
Though, of course, the Revelation is always difficult to try and interpret. And different opinions and interpretations abound.