The soil in which the prayer of faith takes root is a life of unbroken communion with God, a life in which the windows of the soul are always open toward the City of Rest. We do not know the true potency of prayer until our hearts are so intently fixed on God that our thoughts turn to Him whenever they are set free from the consideration of earthly things.
The Hidden Life of Prayer (Kindle) by David M'Intyre, pg 29.