How does God guarantee our faith?

Believers understand that their faith is a gift from God, as seen in 1 John 5:4, which notes that 'this is the victory that overcometh the world, even our faith.' Our ability to have faith lies not in our strength but in the sovereign work of the Holy Spirit, who enables us to believe and persevere. This dynamic underscores God's faithfulness; as Philippians 1:6 asserts, He who began a good work in you will carry it on to completion. Therefore, our assurance rests upon God’s unwavering commitment to sustain our faith.