“The Lord is not slack concerning his promise, as some men count slackness; but is longsuffering toward us, not willing that any should perish, but that all should come to repentance.” (v.9)
Verses 1-9 of this chapter cover the subject of the Lord and His delay. Early in this first section Peter is reminding the brethren that the prophets, the apostles, and even Jesus himself said, “in the last days there shall come in scoffers saying, where is the promise of his coming” (vv.1-4)? He then goes on to remind the brethren that there was another time in human history when men scoffed, during the time of Noah (vv.5-6). Day after day while he was constructing the Ark, Noah heard the voices of the scoffers (for over 100 years), then came the rain, and the skeptic voices changed to pleas of salvation. Peter goes on to encourage the brethren that God is still in control (v.7) and waits in a realm where a day is as a thousand years, and a thousand years as one day (v.8).
Therefore, He is not slack concerning His promised return, for its only been a few days (in His realm). And like the catastrophic flood of Noah’s day, so He has delayed His second coming - giving man time to repent again, not willing that any should perish. So, take advantage of His long-suffering today and come to Jesus, before the “Return of the King.”
The Truth: "For the Lord himself will come down from heaven, with a loud command, with the voice of the archangel and with the trumpet call of God, and the dead in Christ will rise first. After that, we who are still alive and are left will be caught up together with them in the clouds to meet the Lord in the air. And so we will be with the Lord forever.” (1 Thessalonians 4:16-17)