William Hendriksen writes,
“When a man is led through the waters of salvation, these are ankle-deep at first, but as he progresses, they become knee-deep, then reach to the loins, and are finally impassable except by swimming (cf. Ezek. 47:3–6)” (Philippians, Colossians, and Philemon [Grand Rapids: Baker, 1981], p. 150).
There is no growth in the Christian life apart from knowledge: “Do not be conformed to this world, but be transformed by the renewing of your mind, that you may prove what the will of God is, that which is good and acceptable and perfect” (Rom. 12:2). “Be renewed in the spirit of your mind” (Eph. 4:22). From mature knowledge flows holy living.
This is such a great analogy of what it will always be like for a person who accepts Jesus as his Savior. It is ankle deep at first but should progress into a maturity that looks like Christ Himself. For some – this is a lifetime of struggle and for others, it can move rather quickly. This is the work of God – but never apart from our effort and commitment to “letting the word of Christ richly dwell in you” meaning in our thoughts. Walking in the power of the Lord is always in accordance to and submission to the Word of God.