John Owen in commenting on the passage above considered this as the way to squeeze out the mental distractions that keep us from going onto full maturity in Christ. Fixing all of our affections and attention on Jesus Christ is the key. As the apostle Paul wrote to the Corinthians: “And we all, with unveiled face, beholding the glory of the Lord, are being transformed into the same image from one degree of glory to another. For this comes from the Lord who is the Spirit” (2 Cor. 3:18 ESV).
Owen continued by stating that “… most of our spiritual decays and barrenness arise from an inordinate admission of other things into our minds; for these are they that weaken grace in all its operations. But when the mind is filled with thoughts of Christ and his glory, when the soul upon this cleaves to him with intense affections, they will cast out, or not give admittance to, those causes of spiritual weakness and [illness] …” (The Glory of Christ: His Office and Grace, 288).