" The kingdom of heaven, or the grace of Christ within us is like leaven in meal, which does not unite itself perfectly to the meal in an instant, but by degrees until the whole be leavened (Matt. 13:33); or, like the morning light that expels darkness, shining more and more unto the perfect day (Prov. 4:18). "

― Walter Marshall , The Gospel Mystery of Sanctification: Growing in Holiness by Living in Union with Christ