2 Peter 3.9

"The Lord is not slack concerning His promise, as some count slackness; but is long suffering to US-WARD, not willing that any should perish, but that all should come to repentance." 2 Peter 3.9 KJV. (my emphasis).

Does this verse teach that God wants every person in the world to "come to repentance" and that He doesn't want any to "perish"? Clearly, any with a little understanding regarding the case of Peter would know that the Lord was indeed "longsuffering" toward him!

To understand what any single verse in Holy Writ teaches it is necessary to read it in its proper context, and not twist it to teach something else. We must, if we are to be blessed with the study of God's word apply ourselves with an honest conscience. Let us then turn to the first verse of the chapter under consideration: "This second epistle, beloved, I now write unto you; in both which I stir up your pure minds by way of remembrance." (my emphasis). Who, then are the "beloved" that Peter is writing to? The first verse of Peter's second letter reads; " Simon Peter, a servant and an apostle of Jesus Christ, to them that have obtained like precious faith with us through the righteousness of God and our Saviour Jesus Christ."
To any honest student of God's word, it can be clearly seen that Peter isn't writing to the world, but to the "beloved", (the us-ward of 2 Peter 3.9) who are also the "elect" of his first epistle; "Peter an apostle of Jesus Christ, to the elect who are sojourners of the Dispersion in Pontus, Galatia, Cappadocia, Asia, and Bithynia, Elect according to the foreknowledge of God the Father..." 1 Peter 1.1-2a. Of these he says "..give diligence to make your calling and election sure." 2 Peter 1.10. (my emphasis).
It is only those belonging to the US-WARD that God is "not willing that any should perish"! If God didn't want every person in the entire world to perish, none would perish, for His will be done on earth as it is in heaven! let us not forget the Lord's words in Luke 22.31: "Satan hath desired to have you, that he may sift you as wheat." Truly, Peter would have been the Devil's child, had it not been for the pre-destined intervention of God in Christ!