God calls us to think, setting before us the unreasonableness of turning our backs on Him. He shows us what we are rejecting – namely, His forgiving love, the rebuilding of our character, the imparting of life to the soul, and everlasting joy and peace.
Isaiah portrays God as issuing a call to us to reason or argue with Him about His terms for a relationship. What are our grounds for keeping away from Him? What would He say about this, and how would He deal with us?