Tim Keller:

The only time in all the gospels that Jesus Christ prays to God and doesn’t call him Father is on the cross, when he says, “My God, my God, why have you forsaken me?”

Jesus lost his relationship with the Father so that we could have a relationship with God as father.

Jesus was forgotten so that we could be remembered forever—from everlasting to everlasting.

Jesus Christ bore all the eternal punishment that our sins deserve.

That is the cost of prayer. Jesus paid the price so God could be our father.

—Tim Keller, Prayer: Experiencing Awe and Intimacy with God (New York: Dutton, 2014), 79-80.