We are so timid in our drawing on the fountain of God's grace. We are afraid that we have used up our allotted amount and think we have already asked God for to much. How foolish we are, we need to listen to Luther counsel,
"Thus Christ our Lord, to whom we must flee and of whom we must ask all, is an interminable well, the cheif source of all grace, truth, righteousnerss, wisdom, and life, without limit, measure, or end. Even if the whole world were to draw from this fountain enough grace and truth to transform all people into angels, still it would not lose as much as a drop.
This fountain constantly overflows with sheer grace. Whoever wishes to enjoy Christ's grace - and no one is excluded - let him come and receive it from Him. You will never drain this fountain of living water, it will never run dry. You will all draw from it much more than enough, and yet it will remain a perennial well. "Such a preacher," declares John the Baptist, "will be yours. Do not let reliance on your own piety, on your compliance with the law of Moses, or on your many good works keep you from recognizing Him. Your deeds do not stand the test."
Luther's Works 22:134