All outward power that we excercise in the things about us is but a shadow in comparison of that inward power that resides in our will, imagination, and desires; these communicate with eternity and kindle a life which always reaches either heaven or hell . . . here lies the ground of the great efficacy of prayer, which when it is the prayer of the heart, the prayer of faith, has a kindling and creating power, and forms and transforms the soul into everything that its desires reach after: it has the key to the Kingdom of Heaven and unlocks all its treasures, it opens extends and moves that in us which has its being and motion in and with the divine nature, and so brings us into real union and communion with God.
William Law: An Appeal.