Most people are comfortable even happy with their life of SIN. If you are a Rock Star earning lots of money with lots of young girls wanting to be with you, regardless of the cost, then why would you want to repent? The Gospel is not good news to this Rock Star not unless the Holy Spirit convicts him of his SIN.

Nevertheless, as ambassadors of God, we are called to beg people on His behalf to turn from their SIN, to come back into relationship with Him but on His terms. They need to know their eternal destiny is at stake. However, we must also convey to them the extent of their Creator's love for them (Jesus died that they might have life).. But, ultimately they must want to be in relation with God, to love Him as He loves them and as a result are prepared to repent i.e. turn from their sinful life and keep His commandments.

SIN IN THE MILLENNIAL KINGDOM

"Also I saw the souls of those who had been beheaded for the testimony of Jesus and for the word of God, and those who had not worshiped the beast or its image and had not received its mark on their foreheads or their hands. They came to life and reigned with Christ for a thousand years. The rest of the dead did not come to life until the thousand years were ended. This is the first resurrection." Revelation 20:4-5

The most unexpected aspect of Jesus coming Millennial Kingdom on this earth is Satan's part in the story. We are told an angel seizes him and bounds him with a great chain, throws him into "the bottomless pit", shuts it and seals it over him. Note that only another angel was needed to do it. My guess is the angel Michael. Satan is bound for almost the entire 1000 years.

"Then I saw an angel coming down from heaven, holding in his hand the key to the bottomless pit and a great chain. And he seized the dragon, that ancient serpent, who is the devil and Satan, and bound him for a thousand years, and threw him into the pit, and shut it and sealed it over him, so that he might not deceive the nations any longer, until the thousand years were ended. After that he must be released for a little while." Revelation 20:1-3

Why must Satan be released?

"And when the thousand years are ended, Satan will be released from his prison and will come out to deceive the nations that are at the four corners of the earth, Gog and Magog, to gather them for battle; their number is like the sand of the sea. And they marched up over the broad plain of the earth and surrounded the camp of the saints and the beloved city, but fire came down from heaven and consumed them" Revelation 20:7-9

Jesus and the resurrected Saints have been ruling and reigning for 1000 years. Mind you, we are told they rule with a rod of iron. Even with Jesus ruling and Satan bound, Sin is still a major problem. It is a heart problem, people still want to be God and not have anyone, even their Creator to rule over them. Remember, despite being in the presence of God, Satan and a third of the angels rebelled against God. It will still be a major problem with Jesus and the Saints ruling and reigning in the Millennium. The number that rebel is like the "sand of the sea".

"The one who conquers and who keeps my works until the end, to him I will give authority over the nations, and He will rule them with a rod of iron, as when earthen pots are broken in pieces, even as I myself have received authority from my Father." Revelation 2:27