“But when he, the Spirit of truth, comes, he will guide you into all truth. For he will not speak on his own authority, but will speak whatever he hears, and will tell you what is to come.”
God’s revelation was not left to chance. Jesus sent the Spirit to reveal “all truth” to the apostles, who in turn preached and wrote it for all people to follow.
If God gave us all truth, we ought to obey and follow it all. Part of the truth is no truth at all. Partial obedience is disobedience. Let’s be guided by all God’s truth.