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Every just view that can be taken of this subject, admonishes the public, of the necessity of a rigid adherence to the simple, the received and the fundamental doctrine of the constitution, that the power to declare war including the power of judging of the causes of war is fully and exclusively vested in the legislature: that the executive has no right, in any case to decide the question, whether there is or is not cause for declaring war: that the right of convening and informing Congress, whenever such a question seems to call for a decision, is all the right which the constitution has deemed requisite or proper: and that for such more than for any other contingency, this right was specially given to the executive.
In no part of the constitution is more wisdom to be found than in the clause which confides the question of war or peace to the legislature, and not to the executive department. Beside the objection to such a mixture of heterogeneous powers: the trust and the temptation would be too great for any one man: not such as nature may offer as the prodigy of many centuries, but such as may be expected in the ordinary successions of magistracy. War is in fact the true nurse of executive aggrandizement. In war a physical force is to be created, and it is the executive will which is to direct it. In war the public treasures are to be unlocked, and it is the executive hand which is to dispense them. In war the honors and emoluments of office are to be multiplied; and it is the executive patronage under which they are to be enjoyed. It is in war, finally, that laurels are to be gathered, and it is the executive brow they are to encircle. The strongest passions, and most dangerous weaknesses of the human breast; ambition, avarice, vanity, the honorable or venial love of fame, are all in conspiracy against the desire and duty of peace.Hence it has grown into an axiom that the executive is the department of power most distinguished by its propensity to war: hence it is the practice of all states, in proportion as they are free, to disarm this propensity of its influence.
As the best praise then that can be pronounced on an executive magistrate, is, that he is the friend of peace; a praise that rises in its value, as there may be a known capacity to shine in war: so it must be one of the most sacred duties of a free people, to mark the first omen in the society, of principles that may stimulate the hopes of other magistrates of another propensity, to intrude into questions on which its gratification depends. If a free people be a wise people also, they will not forget that the danger of surprise can never be so great, as when the advocates for the prerogative of war, can sheathe it in a symbol of peace.
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Letters of Helvidius, No. IV, August-September 1793, The Writings of James Madison, Galliard Hunt, ed. (1906), VI: 174-75. (Online Library of Liberty)