The state of grace is a condition in which all growth is effortless, a transparent, joyful acquiescence that is a general requirement of all existence. Your own body grows naturally and easily from its time of birth, not expecting resistance but taking its miraculous unfolding for granted; using all of itself with great, gracious, creatively aggressive abandon. You were born in a state of grace; it is impossible for you to leave it. You will die in a state of grace . . . You cannot "fall out of" grace, nor can it be taken from you.
There is no progress in prayer without progress in faith, a purification of faith. And this entails the removal of all the props which depend on human endeavor, human reasoning, signs and the rest. It is the naked faith which is a terrifying experience and yet is the meeting point ultimately between God and ourselves in the depth of our being. This experience of the purification of faith is not normally one which comes early in the spiritual life. We must learn to wait.