In The Necessity of Prayer, (click for free PDF book format)E. M. Bounds quotes this advice, giving credit only to „an eminent old divine”:
Would you be freed from the bondage to corruption? Would you grow in grace in general and grow in grace in particular? If you would, your way is plain.
Ask of God more faith. Beg of him morning, and noon and night, while you walk by the way, while you sit in the house, when you lie down and when you rise up; beg of him simply to impress divine things more deeply on your heart, to give you more and more of the substance of things hoped for and of the evidence of things not seen.
From Chapter 2, „Prayer and Faith (Continued)”