would still be open for the scientific skeptic to affirm that the causes of the difference are to be found in those elements whose varying values had not been enumerated in the statement of the problem, and not in any Divine interposition in answer to prayer.[433] He might claim that the patients were not all of the same age or temperament, the physicians were not all of equal skill, the nurses were not all alike attentive, the climatal and sanitary conditions were not equal, and the question would be left in precisely the same condition as before. Whatever may be the award of a thoughtless derision, we do not hesitate in saying that the proposition is an improper one, and can not be entertained. Especially because there is one party concerned in this matter for whom no human being is authorized to make any engagements, and that is "the Hearer and Answerer of Prayer." There is only one class of blessings for which He has given us any warrant to pray unconditionally, and these are _spiritual_ blessings. For strength to resist temptation, to endure affliction, and perform well our appointed work in life; for grace to purify our nature, elevate our aims, conquer our selfishness and pride, and help us to form a noble character, God has authorized and commanded us to pray. But for the blessings of this life, for deliverance from danger and suffering, for restoration from sickness and for long life, we are taught to pray in submission to that highest wisdom which knows what is best for us, and to append to every supplication, however ardent our desire and intense our solicitude, "Nevertheless, not as I will, but as Thou wilt." This submission is the loftiest attitude of prayer.