"If the Nation is living within its income, its credit is good. If, in some crises, it lives beyond its income for a year or two, it can usually borrow temporarily at reasonable rates. But if, like a spendthrift, it throws discretion to the winds, and is willing to make no sacrifice at all in spending; if it extends its taxing to the limit of the peoples power to pay and continues to pile up deficits, then it is on the road to bankruptcy."