CS Lewis on Sanctification

"I cannot, by direct moral effort, give myself new motives. After the first few steps in the Christian life we realise that everything which really needs to be done in our souls can be done only by God." CS Lewis. [See link below.]

2 Corinthians 3:18. NASB95
18 But we all, with unveiled face, beholding as in a mirror the glory of the Lord, are being transformed into the same image from glory to glory, just as from the Lord, the Spirit.

2 Corinthians 3:18. Amplified
18 And all of us, as with unveiled face, [because we] continued to behold [in the Word of God] as in a mirror the glory of the Lord, are constantly being transfigured into His very own image in ever increasing splendor and from one degree of glory to another; [for this comes] from the Lord [Who is] the Spirit.

2 Corinthians 3:18. Wuest
Now, as for us, we all, with uncovered face, reflecting as in a mirror the glory of the Lord, are having our outward expressions changed into the same image from one degree of glory to another according as this change of expression proceeds from the Lord, the Spirit, this outward expression coming from and being truly representative of our Lord.