And so our faith, even one active in loving obedience, is not, by itself, a magical cure for sin. Faith taps into the energy of resurrection life in the Messiah. The exercise of faith is like the shifting of gears which enables an automobile engine to move the car forward. But this energy is available only in a relationship with the indwelling Spirit of God. Victory over sin without communion with God would be a meaningless contradiction, since God’s highest will for our lives is communion with him. A legalistically faultless life lived without fellowship with God would be hollow. But a flawed life which struggles to maintain communion with God is still pleasing to him and may be full of vital spirituality.
Quoted from Lovelace, R. F. (1985). Renewal as a way of life: A guidebook for spiritual growth. Downers Grove, Ill: InterVarsity Press, p. 147.