How do we know whether we are God’s elect? We know it through faith, by having a vital relationship with Jesus Christ. In Christ and His promises in His Word, we find assurance of our election. As 1 John repeatedly tells us, when we possess Christ in His Word, desire Him for His own sake, know Him in our souls, yearn for Him in our walk of life, and love those who love Him, we know that we have passed from death to life as God’s elect. Ultimately, then, Christ is our assurance of election.

Joel R. Beeke, Living for God’s Glory: An Introduction to Calvinism, Loc. 967.