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36 are to be apprehended. The legislature is the aggressive spirit. It is the motive power of the government, and unless the judiciary can check it, the courts are of comparatively little worth as balance-wheels in the system. It is the subtile, stealthy, almost imperceptible encroachments of policy, of political action, which constitute the precedents upon which additional prerogatives are generally reared; and yet these are the very encroachments with which it is hardest for the courts to deal, and concerning which, accordingly, the federal courts have declared themselves unauthorized to hold any opinions. They have naught to say upon questions of policy. Congress must itself judge what measures may legitimately be used to supplement or make effectual its acknowledged jurisdiction, what are the laws “necessary and proper for carrying into execution” its own peculiar powers, “and all other powers vested by” the “Constitution in the government of the United States, or in any department or officer thereof.” The courts are very quick and keen-eyed, too, to discern prerogatives of political discretion in legislative acts, and exceedingly slow to undertake to discriminate between what is and what is not a violation of the spirit of the Constitution. Congress must wantonly go very far outside of the plain and unquestionable meaning of the