1) Paul said he could find himself disqualified. Disqualified from what? Salvation? Entering the Kingdom of God?
1Co 9:27 But I discipline my body and keep it under control, lest after preaching to others I myself should be disqualified.
2) What is the Kingdom of God? Rich men will enter it with much difficulty, surely that doesn't mean rich men can't ever receive salvation?
Mat 19:24 Again I tell you, it is easier for a camel to go through the eye of a needle than for a rich person to enter the kingdom of God.”
Mat_6:33 But seek first the kingdom of God and his righteousness, and all these things will be added to you.
Mat_12:28 But if it is by the Spirit of God that I cast out demons, then the kingdom of God has come upon you.
Mat_21:31 Which of the two did the will of his father?” They said, “The first.” Jesus said to them, “Truly, I say to you, the tax collectors and the prostitutes go into the kingdom of God before you.
Mar_1:15 and saying, “The time is fulfilled, and the kingdom of God is at hand; repent and believe in the gospel.”
Mar_9:1 And he said to them, “Truly, I say to you, there are some standing here who will not taste death until they see the kingdom of God after it has come with power.”
Mar_9:47 And if your eye causes you to sin, tear it out. It is better for you to enter the kingdom of God with one eye than with two eyes to be thrown into hell,
3) What is the difference between the Gospel of Christ and the Gospel of God?
Rom_15:19 by the power of signs and wonders, by the power of the Spirit of God—so that from Jerusalem and all the way around to Illyricum I have fulfilled the ministry of the gospel of Christ;
1Co_9:12 If others share this rightful claim on you, do not we even more? Nevertheless, we have not made use of this right, but we endure anything rather than put an obstacle in the way of the gospel of Christ.
Gal_1:7 not that there is another one, but there are some who trouble you and want to distort the gospel of Christ.
Php_1:27 Only let your manner of life be worthy of the gospel of Christ, so that whether I come and see you or am absent, I may hear of you that you are standing firm in one spirit, with one mind striving side by side for the faith of the gospel,
Mar_1:14 Now after John was arrested, Jesus came into Galilee, proclaiming the gospel of God,
Rom_1:1 Paul, a servant of Christ Jesus, called to be an apostle, set apart for the gospel of God,
1Th_2:8 So, being affectionately desirous of you, we were ready to share with you not only the gospel of God but also our own selves, because you had become very dear to us.
1Pe_4:17 For it is time for judgment to begin at the household of God; and if it begins with us, what will be the outcome for those who do not obey the gospel of God?
I've just discovered a former Moody Bible Institute professor's (Charles Cooper), series on the Gospel of God, the Gospel of Christ, and the Kingdom of God as expressed by Christ and the epistles. Cooper believes knowing the difference between the three is essential to the Christian walk and understanding of eternity.
I don't have a clear understanding of the difference between the two gospels or exactly what the kingdom of God is that we should be striving to enter. I'm interested in your studies and thoughts.