Battling unbelief

This morning, i found a really cool quote in Piper's book "Battling unbelief". It was actually a continuation of the quote i was talking about in the previous post. Here it is:

"Battling unbelief and fighting for faith in future grace means that we fight fire with fire. We throw against the promises of sin the promises of God. We take hold of some great promise God made about the future and say to a particular sin, "Match that!" In this way we do what Paul says in Romans 8:13 : "By the Spirit...put to death the deeds of the body." John Owen wrote a book on that verse and summed it up with, "Be killing sin, or it will be killing you." We kill sinful deeds before they happen by cutting the root of their life: the lies of sin.

Doing this "by the Spirit" means that we trust in the power of the Spirit and then wield the "sword of the Spirit," which is the Word of God (Ephesians 6:17). The "word of God" is at the core of the gospel; and then all that God has spoken in His revealed word. The gospel of Christ's death and resurrection is not only the core but foundation of all the promises of God. That is the point of the logic in Rom 8:32 "He who did not spare His own Son but gave Him up for us all, how will He not also with Him graciously give us all things?" "All things" that we need -- the fulfillment of all God's promises -- are guaranteed by the Father's not sparing His Son. Or to put it positively, all the promises of God are secured for us because God sent His Son to live and die to cancel our sin and become our righteousness. So when I say that we wield the Word of God, the sword of the Spirit, what I mean is that we hold fast to this Christ-centered gospel truth with all its promises, and bank on them in every situation. We sever the lifeline of sin by the power of a superior promise."