Do men normally cooperate with God? Is it in their nature to cooperate with God? Is it native to their wills to cooperate with God? I would say that the evidence of cooperation with God is the evidence of the work of the Holy Spirit and the Word of God. C.H. Spurgeon says,
"You might as well expect to raise the dead by whispering in their ears, as hope to save souls by preaching to them, if it were not for the agency of the Spirit."
D.A Carson wrote,
"There has not only been an objective, public act of divine self-disclosure in the crucifixion of God’s own Son, but there must be a private work of God by His Spirit, in the mind and heart of the individual. If we should express unqualified gratitude to God for the gift of His Son, we should express no less gratitude for the gift of the Spirit who enables us to grasp the gospel of His Son…Unless the Spirit enlightens us, God’s thoughts will remain deeply alien to us."