I declare to you, brothers and sisters, that flesh and blood cannot inherit the kingdom of God, nor does the perishable inherit the imperishable. (1 Corinthians 15:50 NIV)
Man is composed of flesh, soul, and spirit. The spirit preserves and fashions the temple of flesh. Between these two is the soul. When the soul follows the spirit, is raised up by it, but sometimes it sympathizes with the flesh, and falls into carnal lusts.
So I say, walk by the Spirit, and you will not gratify the desires of the flesh. (Gal 5:16 NIV)
Those then, as many as they be, who have not that which saves and forms us into eternal life, shall be called, "flesh and blood" for they do not have the Spirit of God in themselves. Men of this type are spoken of by the Lord as "dead".
But Jesus told him, "Follow me, and let the dead bury their own dead." (Matt 8:22 NIV)
He calls them dead because they have not the Spirit that quickens a man.
As for you, you were dead in your transgressions and sins, in which you used to live when you followed the ways of this world and of the ruler of the kingdom of the air, the spirit who is now at work in those who are disobedient. All of us also lived among them at one time, gratifying the cravings of our flesh and following its desires and thoughts. Like the rest, we were by nature deserving of wrath. (Ephesians 2:1-3 NIV)
On the other hand, as many as fear God and trust in His Son's advent, and who through faith do establish the Spirit of God in their hearts,-such men as these shall be properly called both "pure," and "spiritual," and "those living to God," because they possess the Spirit of the Father, who purifies man, and raises him up to the life of God.
No, a person is a Jew who is one inwardly; and circumcision is circumcision of the heart, by the Spirit, not by the written code. Such a person's praise is not from other people, but from God. (Romans 2:29 NIV)
For as the Lord has testified:
"Watch and pray so that you will not fall into temptation. The spirit is willing, but the flesh is weak." (Matthew 26:41 NIV)
So "the flesh is weak," but also "the spirit is willing." For the spirit is capable of working out its own suggestions.
Therefore, if anyone were to mix the ready inclination of the Spirit, to be as it were, a stimulus to the infirmity of the flesh, it inevitably follows that what is strong will prevail over the weak, so that the weakness of the flesh will be absorbed by the strength of the Spirit; and that the man in whom this takes place cannot in that case be carnal, but Spiritual, because of the fellowship of the Spirit.
Therefore the martyrs bear their witness, and despise death, not after the infirmity of the flesh, but because of the readiness of the Spirit. For when the infirmity of the flesh is absorbed, it exhibits the Spirit as powerful; and again, when the Spirit absorbs the weakness [of the flesh], it possesses the flesh as an inheritance in itself, and from both of these is formed a living man,-living, indeed, because he partakes of the Spirit, but man, because of the substance of flesh.
The flesh, therefore, when destitute of the Spirit of God, is dead, not having life, and cannot possess the kingdom of God: as it is irrational blood, like water poured out upon the ground.
As was the earthly man, so are those who are of the earth; and as is the heavenly man, so also are those who are of heaven. (1 Cor 15:48 NIV)
In the case of Martyrs the rational blood is preserved by God for the avenging of those that shed it.
Do not take revenge, my dear friends, but leave room for God's wrath, for it is written: "It is mine to avenge; I will repay," says the Lord. (Romans 12:19)
The flesh possessed by the Spirit, forgetful indeed of what belongs to it, and adopting the quality of the Spirit, being made conformable to the Word of God.
And just as we have borne the image of the earthly man, so shall we bear the image of the heavenly man. (1 Corinthians 15:49 NIV)
What, therefore, is the earthly? That which was fashioned. And what is the heavenly? The Spirit.
But now, by dying to what once bound us, we have been released from the law so that we serve in the new way of the Spirit, and not in the old way of the written code. (Romans 7:6 NIV)
Or don’t you know that all of us who were baptized into Christ Jesus were baptized into his death? We were therefore buried with him through baptism into death in order that, just as Christ was raised from the dead through the glory of the Father, we too may live a new life. (Romans 6:3-4 NIV)
...He saved us through the washing of rebirth and renewal by the Holy Spirit (Titus 3:5 NIV)
The apostle exhorts us through faith and chaste conversation to preserve the Spirit of God.
May God himself, the God of peace, sanctify you through and through. May your whole spirit, soul and body be kept blameless at the coming of our Lord Jesus Christ. (1 Thessalonians 5:23 NIV)
Unless having become non-participators of the Divine Spirit, we lose the kingdom of heaven.
But the subjects of the kingdom will be thrown outside, into the darkness, where there will be weeping and gnashing of teeth." (Matthew 8:12 NIV)
And he exclaims:
I declare to you, brothers and sisters, that flesh and blood cannot inherit the kingdom of God, nor does the perishable inherit the imperishable. (1 Corinthians 15:50 NIV)
Speaking strictly, we would say that the flesh does not inherit, but is inherited; as also the Lord declares:
Blessed are the meek, for they will inherit the earth. (Matthew 5:5 NIV)
As if in the future kingdom, the earth, from where exists the substance of our flesh, is to be possessed by inheritance. This is the reason for His wishing the temple (the flesh) to be clean, that the Spirit of God may take delight therein, as a bridegroom with a bride. As, therefore in old Jewish tradition, the bride cannot be said to wed, but to be wedded, when the bridegroom comes and takes her, so also the flesh cannot by itself possess the kingdom of God by inheritance; but it can be taken for an inheritance into the kingdom of God. For a living person inherits the goods of the deceased; and it is one thing to inherit, another to be inherited. The former rules, and exercises power over, and orders the things inherited at his will; but the latter things are in a state of subjection, are under order, and are ruled over by him who has obtained the inheritance.
What, therefore, is it that lives? The Spirit of God, doubtless. What, again, are the possessions of the deceased? The various parts of the man, surely, which rot in the earth. But these are inherited by the Spirit when they are translated into the kingdom of heaven. For this cause, too, did Christ die. That the Gospel covenant being manifested and known to the whole world, might in the first place set free His slaves; and then afterwards, as I have already shown, might constitute them heirs of His property, when the Spirit possesses them by inheritance. For he who lives inherits, but the flesh is inherited. In order that we may not lose life by losing that Spirit which possesses us, the apostle, exhorting us to the communion of the Spirit, has said, according to reason, in those words already quoted, "That flesh and blood cannot inherit the kingdom of God." Just as if he were to say, "Do not err; for unless the Word of God dwell with, and the Spirit of the Father be in you, and if you shall live frivolously and carelessly as if you were this only, viz., mere flesh and blood, you cannot inherit the kingdom of God."
So no. A homosexual sympathizes and is in communion with the flesh, and therefore does not have the Spirit. For the flesh is not buried with Jesus. Nor are the sins covered.
If we have been united with him like this in his death, we will certainly also be united with him in his resurrection. (Romans 6:5 NIV)
So if the imperishable never inherits the perishable. The perishable remains perishable and perishes.
Then death and the grave were thrown into the second death. (Revelation 20:14 De-Analogized)
Reference:
[1] Chapter IX
http://www.earlychristianwritings.com/text/irenaeus-book5.html