Whether wisdom or unwisdom resides in the scheme of benefits set forth in Title II it is not for us to say. The answer to such inquiries must come from Congress, not the courts. Our concern here, as often, is with power, not with wisdom. Counsel for respondent has recalled to us the virtues of self-reliance and frugality. There is a possibility, he says, that aid from a paternal government[p645] may sap those sturdy virtues and breed a race of weaklings. If Massachusetts so believes and shapes her laws in that conviction, must her breed of sons be changed, he asks, because some other philosophy of government finds favor in the halls of Congress? But the answer is not doubtful. One might ask with equal reason whether the system of protective tariffs is to be set aside at will in one state or another whenever local policy prefers the rule of laissez faire. The issue is a closed one. It was fought out long ago. ^[n10]When money is spent to promote the general welfare, the concept of welfare or the opposite is shaped by Congress, not the states. So the concept be not arbitrary, the locality must yield. Constitution, Art. VI, Par. 2.