What is the role of the The Holy Spirit in conversion?

He applies salvation to the sinner by: (1) Opening our eyes to behold the beauty of Christ, (2) Showing us our sin, (3) Giving us assurance. Why does this matter? (1) Fuels our prayers for the lost, (2) Increases our confidence in evangelism, (3) Protects us from faulty methods, (4) Expands our worship.