It means that true faith is not generated by our own abilities but rather given to us by God through His Spirit.
The assertion that faith is not of ourselves emphasizes that genuine faith cannot be produced by human will or strength. In fact, the scripture indicates that the natural man is unable to understand or accept the things of God (1 Corinthians 2:14). This is where the divine work of God is indispensable; He alone is responsible for enabling us to believe. As stated in the sermon, 'the carnal mind is enmity against God,' demonstrating our spiritual incapacity. True faith is thus a miraculous act of God whereby He instills belief within our hearts, drawing us to Himself and transforming our desires to embrace Christ and His gospel.
Commentary