The Christian Bible ends with an explicit promise that Jesus is coming back soon:
He who testifies to these things says, “Yes, I am coming soon.”Amen. Come, Lord Jesus.
21 The grace of the Lord Jesus be with God’s people. Amen. (Revelation 2:20-21 NIV)
It may seem that Jesus failed to keep His promise to come back soon. However, we need to remember that God is much older than we are (He has existed from infinity past). The Apostle Peter states that God views the passage of 1,000 years the same way that flesh and blood humans view the passage of a day. So from God’s perspective, it has only been two days since Jesus walked on Earth! In fact, the Apostle Peter gives us an excellent reason why Jesus might wait thousands of years to come back:
But do not forget this one thing, dear friends: With the Lord a day is like a thousand years, and a thousand years are like a day. 9 The Lord is not slow in keeping his promise, as some understand slowness. Instead he is patient with you, not wanting anyone to perish, but everyone to come to repentance. (II Peter 3:8-9)
The reason why Jesus has waited so long to come back is because He loves us. When Jesus came to Earth the first time He came only as Savior. But when He comes the second time He will also come as judge. He will have to destroy the wicked. But God loves all people, and therefore He has given human beings 2,000 + years to repent of their sins.
For those who doubt the seriousness of Jesus’ promise to return, I refer you to Peter’s earlier words of warning:
Above all, you must understand that in the last days scoffers will come, scoffing and following their own evil desires. 4 They will say, “Where is this ‘coming’ he promised? Ever since our ancestors died, everything goes on as it has since the beginning of creation.” 5 But they deliberately forget that long ago by God’s word the heavens came into being and the earth was formed out of water and by water.6 By these waters also the world of that time was deluged and destroyed. 7 By the same word the present heavens and earth are reserved for fire, being kept for the day of judgment and destruction of the ungodly. (II Peter 3:3-7)
I think that passage pretty well sums it up. Jesus will come back soon and prove the scoffers wrong. Your judgment and my judgment will come back soon, regardless of whether or not we live until the final days. We must all die, and then we will face God. Be ready.
Finally, if you have believed in Jesus Christ and repented of your sins, then the following words of encouragement apply:
The grace of the Lord Jesus be with God’s people. Amen.