The Gospel of Christ Jesus is the totality of truth. This saving Truth comes from God through the Holy Spirit unto men.
This Truth is Jesus Christ.
You cannot act upon the truth, my dear friend for you have no power to, but the Truth can act upon you. It is only the Truth that can change you. Jesus is the Truth that sets free from sin, the world and demonic oppressions.(John 8:32)
All you need to do is to accept the Truth(Jesus) and believe on the Word of Truth, for the Truth to have its way in your life, making you a new creature, a son born from above!