The first 2 chapters of 2 Peter have been building up to this final chapter. Peter wants to remind us of something important, with a call for us to grow in the grace and knowledge of Jesus Christ. Having the full and true knowledge of Christ will give us everything we need for life and godliness, to be certain of our calling and His choosing us, and so that we will never stumble. Even though there will be those that would seek to lead us astray, we are called to remember His promises and rely on the Word of God. Of prime importance, Peter wants to reminds us of the promise and hope of the second coming (Greek, parousia) of Jesus Christ. He wants to reminds us that we are in the last days, why Christ has not yet come again and why having the true knowledge of this affects our posture as to how we live our life now.