In this passage Paul is not teaching that election is a joint enterprise between God and man. Election is exclusively the work of God. It is, as we have seen, monergistic. Paul is speaking here about the outworking of our salvation that follows our election. He is specifically referring here to the process of our sanctification. Sanctification is not monergistic. It is synergistic. That is, it demands the cooperation of the regenerate believer. We are called to work to grow in grace. We are to work hard, resisting sin unto blood if necessary, pummeling our bodies if that is what it takes to subdue them.