My friend, Jordan told me about this song and said he had heard God speak to him through it. I stopped to listen to it and thought it had a great message, very relevant to the doubts he is going through. I believe Jesus did indeed use this song to speak to him.
God uses our struggles with sins, our struggles with doubts, and all our trials in life to get what is inside, outside. It may not feel like it, but God is making you all that you were meant to be. Even though we don't understand what is going on, God is involved in our lives (for our good) and He will in no way leave us. He swore by an oath. He swore by Himself.
Malcolm Smith described God's oath as God saying, "May God strike God dead" if He does not remain faithful to His covenant of grace with us that is because of Jesus.
"Your sins are forgiven for His namesake."