How do we know that we have true knowledge as Christians?

According to the new covenant promises found in Hebrews, God will place His laws in our minds and write them on our hearts. This indicates that all believers will know Him directly, as they are taught by the Holy Spirit rather than relying on human wisdom or learning. In Ephesians 4, Paul contrasts the believer's understanding with that of the Gentiles, highlighting that Christians learn Christ and are taught the truth that is in Him, which assures them of the true knowledge they possess. This transformation is a result of the Holy Spirit revealing Christ in us, equipping us with the knowledge necessary for spiritual growth and discernment.