I believe it is too late to call on God if Christ comes as a thief if one is punished and dies in a way that his death will come certainly within a short time if it is from God if one got sick knowingly while he was living in sin because he wasn’t repenting before that or even not from God but one wasn’t repenting and loses opportunity to repent but all others who are alive God wants them to be saved to come to a knowledge of the truth. One should not presume if one lives in sin he will have a chance to repent for God does not have to give more chances to one if person has no cause to sin God may give others a chance if God thinks they should have a chance if a person did not get all fair chances and that one perhaps might repent. So people should seek to repent while they have opportunity.
I thought people perhaps who did reject the gospel and did not want to believe it and opposed it who then could not see the truth as they did not want to know the truth that perhaps they can still be saved that God can still convict them to accept Jesus even if they don’t have full assurance and they can be saved even in last moment even if they don’t confess Him as I believed they may not be able to if they can’t speak but they still are alive and have breath as I believe Jesus said only sin not forgiven is to blaspheme the Holy Spirit to live rejecting Jesus when you know who He is or to completely reject Him to decide He is false to not be willing to accept Jesus to respond to Holy Spirit which draws you to Jesus to return to Him if you had thought before of coming or to come to Him. But I may be wrong as Spirit may be able to give person full assurance if you are seeking Him while you have opportunity if you still have breath
but people may not have opportunity to accept Jesus later so people should accept Him now as Jesus said He can come as a thief and only those who confess that they believe in Jesus and follow Him can be guaranteed to be saved as they may not get opportunity to repent later.
Charles spurgeon wrote below
Now I hear another say, "Ah, but the stone in my road is that I cannot believe. I have not the faith I need to have." Well, beloved Seeker, perhaps you have made a mistake about your faith. Do you think that you need to believe with full assurance before you can be saved? If so, listen. The smallest grain of saving faith will save a man. To embrace Christ in your arms like Simeon is a grand act for a full-grown saint, but to touch the hem of His garment is as surely saving as to embrace His Person. If you have faith but as a grain of mustard seed, God will recognize that faith and make it grow— and that faith will save you. It is not quantity, but quality that the Lord looks at. Do you believe in Jesus Christ? That is the point. For, remember, the whole of your salvation rests not on your believing, but on the merits of Jesus Christ!
Some sinners look too much to their own faith and not enough to the Object of their faith. Now, it is the Object of faith we should look to, and if we did, our faith would grow. You may look at faith till you think you have none. But, on the other hand, you may look at Christ till you feel you cannot help believing in Him. How many a time in my little vestry behind there have I charged this Truth of God home upon those who have said they could not believe. I have said, "What cannot you believe? Cannot you believe God? Is He a liar?" "Ah!" say I to these enquirers, "suppose you said to me when I told you something, 'I can't believe you,' should I not at once say, 'Why not? What do you know of my character which leads you to think that I am untruthful?' " And they say at once, "Oh, Sir, I should not say that to you. I should feel sure if you told me that you knew a thing to be true that it was so. I would believe you." "Well, then," I have said, "how dare you tell me you cannot believe Jesus Christ and cannot believe God the Eternal One! What reason on earth can there be why you should not believe God is speaking the Truth and believe what Jesus Christ says? We will not have it that you cannot believe." Awakened, quickened Sinner! At the same moment that God gave you spiritual life to feel that you were a sinner, He gave you the principle in which dwells power to believe in Jesus Christ, the sinner's Savior! And we charge you to exercise that power and to cast yourself, once and for all, upon the finished Sacrifice of Christ the Lord!
C. H. Spurgeon: Spurgeon's Sermons Volume 19: 1873 - Christian Classics Ethereal Library