Simon Peter, a bondservant and apostle of Jesus Christ, To those who have received a faith of the same kind as ours, by the righteousness of our God and Savior, Jesus Christ: Grace and peace be multiplied to you in the knowledge of God and of Jesus our Lord; seeing that His divine power has granted to us everything pertaining to life and godliness, through the true knowledge of Him who called us by His own glory and excellence. For by these He has granted to us His precious and magnificent promises, so that by them you may become partakers of the divine nature, having escaped the corruption that is in the world by lust. Now for this very reason also, applying all diligence, in your faith supply moral excellence, and in your moral excellence, knowledge, and in your knowledge, self- control, and in your self- control, perseverance, and in your perseverance, godliness, and in your godliness, brotherly kindness, and in your brotherly kindness, love. For if these qualities are yours and are increasing, they render you neither useless nor unfruitful in the true knowledge of our Lord Jesus Christ. For he who lacks these qualities is blind or short- sighted, having forgotten his purification from his former sins. Therefore, brethren, be all the more diligent to make certain about His calling and choosing you; for as long as you practice these things, you will never stumble; for in this way the entrance into the eternal kingdom of our Lord and Savior Jesus Christ will be abundantly supplied to you. 2 Peter 1:1–11, NASB
After God dragged me from my former Arminian doctrinal beliefs into the truth of Reformed Theology, my assurance of my salvation did not suffer at all. In fact, it deepened as the profundity of our salvation by grace and justification by faith became apparent to me. I no longer had a fractured or nebulous picture of God’s eternal plan. It all came into focus as I studied the “Ordo Solutis” from Romans 8:29–30 and Ephesians 1 & 2. However, some I have attempted to teach these truths have virulently resisted. One of the questions these “resistors of the truth” seem to always ask is, “How could you ever have assurance believing that?”