From David Mathis at the DesiringGod blog introducing John Piper's recent sermon on John 3:1-10:

This week's sermon: "The Free Will of the Wind"

The Wind has a will of his own.

We don't control the Wind of God's Spirit. He gives the new birth as he pleases. His will is decisive, not ours. For sure, our will moves when we receive the new birth—it moves toward the crucified Christ. But the decisive Mover is the Spirit. He gets the credit for our new birth.

The free will of the Wind is threatening to those who would be captain of their own souls. But to those who know they are desperate, dead in sin, and utterly unable to save themselves, this truth can be thrilling.