The Great Exchange

But there is one moment in the Gospels where Jesus does not use "Abba" in His reference to God the Father. When Jesus is on the cross, He yells out, "My God, My God, why have You forsaken Me?" In this moment Jesus was being condemned for us, becoming sin for us; thus He could not enjoy the close relationship with Abba. He experienced painful separation from the Father so we can experience joyful connection with Him.

--Eric Geiger, Michael Kelley, and Philip Nation, Transformational Discipleship: How People Really Grow (Nashville: B&H, 2012), 101.