How is Good Friday ever Good?

Ian Mobsby gives an address on the place of Good Friday in the passion of Holy Week. He explores how Good Friday can ever be considered good in salvation history. This was part of a traditional Anglican Good Friday Service, which begins with the ministers prostrating themselves on the floor before the altar as a dramatic sign of the cost of the Cross for Christ. Good Friday. How is it possible, that on this day, when we remember Jesus the man and his painful walk from Jerusalem, carrying his cross to the hill of Golgotha. When we humanity killed the incarnation of God in human flesh. How can this Friday possibly be called Good? Good Friday?