There is a limit to the doctrine of the prayer of faith. We are not to expect that God will give us everything we choose to ask for. We know that we sometimes ask, and do not receive, because we ask amiss. If we ask for that which is not promised–if we run counter to the spirit which the Lord would have us cultivate–if we ask contrary to his will, or to the decrees of his providence–if we ask merely for the gratification of our own ease, and without an eye to his glory, we must not expect that we shall receive. Yet, when we ask in faith, nothing doubting, if we receive not the precise thing asked for, we shall receive an equivalent, and more than an equivalent, for it. … If he does not give you precisely what you ask for, he will give you that which is tantamount to it, and that which you will greatly rejoice to receive in lieu thereof. Be then, dear reader, much in prayer, and make this evening a season of earnest intercession, but take heed what you ask.
— C. H. Spurgeon, Morning and Evening, Evening devotion for May 19