How do we know that God gives faith to believers?

The Apostle Paul highlights in Ephesians 2:8-9 that faith is a gift from God, explicitly teaching that it is not of ourselves, lest any man should boast. This doctrine underlines the total depravity of man and the sovereignty of God in salvation, where faith is granted to the elect by His mercy alone. In the proclamation of the gospel, God calls forth a response of faith where the spiritually dead are made alive. The assurance that faith is given rather than earned emphasizes the grace and power of God in the salvation of His people.