"God's grace is not easily reconciled to our math, but that does not diminish its beauty or scope. When we serve our Lord out of true and full thanksgiving for his defeat of the guilt and power of our sin, we are grateful not merely for his benevolently receiving our works but for his enabling of us to do what he will ultimately reward. This side of heaven, we will never logically resolve the tension between human responsibility and divine provision in sanctification. But as we learn to acknowledge that God must provide what we need to please him, the result will be our full dependence upon his grace. While our logic may not be satisfied in this dependence, it is the only place where the heart conscious of its humanity can find rest."
Bryan Chapell, Holiness by Grace