How do we know true saving faith is from God?

According to Ephesians 1:19, true saving faith is described as 'the exceeding greatness of his power to us who believe, according to the working of his mighty power.' This passage emphasizes that all genuine faith originates from God's sovereign grace, rather than our own efforts. Faith is both a gift and an action generated by the Holy Spirit, illuminating the hearts and minds of believers to recognize their need for salvation in Christ. It signifies a profound transformation driven by divine initiative, illustrating how God opens the eyes of the blind and frees individuals from darkness, leading them to the light of His truth.