How do we know perseverance in faith is true?

Perseverance in faith is substantiated throughout the New Testament, particularly in passages that reaffirm the necessity of enduring to the end for salvation. In Matthew's Gospel, Jesus states that those who endure to the end will be saved. Additionally, Paul’s writings consistently encourage believers to strive for the faith and to contend earnestly for the gospel. This doctrinal understanding rests on the sovereignty of God, who sustains His people and equips them with the means—such as the Spirit and the armor of God—to continually stand firm in their faith.