How do we know that salvation is a revelation from God?

Saul of Tarsus, prior to his conversion, had extensive knowledge about Jesus yet lacked true understanding of the gospel. As Paul reflects on his transformation in Galatians 1:15-16, he acknowledges that God revealed His Son to him for salvation. This illustrates that saving faith is not merely intellectual acknowledgment of facts but a divine revelation that enables one to trust in Christ fully for salvation. As noted in Ephesians 1:17-18, believers need God to enlighten their hearts to grasp the fullness of their calling and blessings in Christ.