God Created the World for Good Friday

John Piper explains how and why he has become more Christocentric in his preaching over the years. Here's the outline of his theological reasoning:

The apex of God's display of his own glory is the display of his grace.
God's glorification of his grace was planned before creation.
God's glorification of his grace was to happen through the Son of God, Jesus Christ.
From eternity the apex of God's glorification of his grace was designed to be Christ's crucifixion for sinners.
God's glorification of his grace in the crucifixion of his Son for sinners was the ultimate purpose for creating the universe.
Therefore God planned from eternity that the revelation of his glory would be the ultimate reason for creating the universe.

Read the whole thing for scriptural support and further explanation.