It seems like there may be a limit to the availability to receive God's promises. some people the door is shut, like when revelation tribulation starts. if someone knows about the promises of God, and falls away, can they hold on to the promises of God and start again? If someone fell away from God, can he still pray?
In the Revelation where we have the letters to the seven churches, Jesus to the church in Laodicea says He stands at the door and knocks. This is written not to the unbelieving, but the believing. For the criticism against the Christian community in Laodicea is that they had lost their love, and had effectively shut Christ out from their midst--but He reminds them that He's never left them, He's still there knocking on their door, and He will come in and sup with them if they don't keep the door shut on Him.
I don't believe in the Dispensationalist doctrine of a future "rapture" right before a period of tribulation; that's never been Christian teaching. Which also means that the idea that there will come a time when God shuts the door on His promises likewise has no merit.
Instead, what does the Lord teach St. Peter? Peter came to the Lord and asked Him, "How many times must I forgive? Seven times?" And the Lord responds that it's not seven times but rather, "Seventy times seven times", by which the Lord means there is no limit to how many times we should forgive. Forgiveness has no limit. Now Christ our Lord having taught us that there is to be no limit to our forgiveness of others shows us also that there is no limit to God's forgiveness. Indeed, in the Gospel according to St. Luke our Lord says,
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But love your enemies, and do good, and lend, expecting nothing in return, and your reward will be great, and you will be sons of the Most High, for he is kind to the ungrateful and the evil. Be merciful even as your Father is merciful." - Luke 6:36-37
See here what Christ says, God is merciful and kind to the ungrateful and the wicked, which is why we are called to imitate God in being merciful and loving to our enemies, to give freely, to hold none of our love and compassion back--even from those who would hurt us and hate us.
And consider how true this is, for as St. Paul says in Romans 5, we were God's enemies in the unlawfulness of our sin, but even while we were enemies God loved us, and sent His Son in order that we should be redeemed, rescued, and reconciled to God. In fact Paul says, "God demonstrates His love for us in that even while we were yet sinners Christ died for us." Christ did not die for the godly, but the ungodly; God's love was not for those who loved Him, but those who despised Him--you, me, the whole world of sinners.
Seeing that God's love for sinners means His bountiful kindness toward us, and His merciful forgiveness which is freely given through Christ for all, how could there ever be a limit, a shut door, on God's promises?
The Scriptures also are clear, that God is unwilling that any should perish, but that all have everlasting life. God is not on the sidelines waiting for us to come to Him, but rather He has come to us, in the fullness of all His loving-kindness, mercy, grace, and peace which is found in Jesus Christ who gave Himself for us, freely, suffering and dying for our sakes on the cross; and this Jesus God has raised up, seated Him at His right hand, and will come again on the Last Day. And when He comes, He delivers all things over to God the Father, and God will be all in all, and all shall be made whole, all is made new. As the Prophet Isaiah foretold, a new heavens and a new earth, which St. John of Patmos echoes in the Revelation.
"Behold! I make all things new!"
Do not underestimate the gifts and promises of God which are yours in Jesus Christ. God's love knows no bounds, His compassion no limits, His kindness is infinite.
-CryptoLuthearn