God’s Word is Truth. It is the final word on anything. John instructs us to walk in the truth in 2 John 4 and Paul said to speak truth, not lies, in Ephesians 4.25.
How do we do that? We learn it by reading the Word of God. It is our life manual. It is our guide for how we ought to behave. It tells us what God’s expectations of us are. We are to live in truth, to walk in truth and to speak the truth.
Study your Word. Learn what it says. Apply it. That’s the great transformation that we can all have when we put off the old nature and take on the new nature.
I rejoiced greatly that I found of thy children walking in truth, as we have received a commandment from the Father. 2 John 4 (KJV)