"Therefore, I pray you all, my dear sirs and friends, for God’s sake and the poor youths’, not to treat this subject as lightly as some do, who are not aware of what the prince of this world intends. For it is a serious and important matter that we help and assist our youth, and one in which Christ and all the world are mightily concerned. By helping them we shall be helping ourselves and all men. And reflect that these secret, subtle and crafty attacks of the devil must needs be met with deep Christian seriousness. If it is necessary, dear sirs, to expend annually such great sums for firearms, roads, bridges, dams and countless similar items, in order that a city may enjoy temporal peace and prosperity, why should not at least as much be devoted to the poor, needy youth, so that we might engage one or two competent men to teach school?"
-- Martin Luther, “To the Councilmen of All Cities in Germany that They Establish and Maintain Christian Schools,” in AE 45:357 (1524) (emphasis added) A full translation of the letter is available here.