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496 ; since 'tis allow'd, that if men were endow'd with such a benevolence, these rules would never have been dreamt of.

Secondly, we may conclude from the same principle, that the sense of justice is not founded on reason, or on the discovery of certain connexions and relations of ideas, which are eternal, immutable, and universally obligatory. For since it is confest, that such an alteration as that above-mention'd, in the temper and circumstances of mankind, wou'd entirely alter our duties and obligations, 'tis necessary upon the common system, that the sense of virtue is deriv'd from reason, to shew the change which this must produce in the relations and ideas. But 'tis evident, that the only cause, why the extensive generosity of man, and the perfect abundance of every thing, wou'd destroy the very idea of justice, is because they render it useless; and that, on the other hand, his confin'd benevolence, and his necessitous condition, give rise to that virtue, only by making it requisite to the publick interest, and to that of every individual. 'Twas therefore a concern for our own, and the publick interest, which made us establish the laws of justice; and nothing can be more certain, than that it is not any relation of ideas, which gives us this concern, but our impressions and sentiments, without which every thing in nature is perfectly indifferent to us, and can never in the least affect us. The sense of justice, therefore, is not founded on our ideas, but on our impressions.

Thirdly, we may farther confirm the foregoing proposition, that those impressions, which give rise to this sense of justice, are not natural to the mind of man, but arise from artifice and human conventions. For since any considerable alteration of temper and circumstances destroys equally justice and injustice; and since such an alteration has an effect only by changing our own and the publick interest; it follows, that the first establishment of the rules of justice depends on these different interests. But if men pursu'd the publick interest naturally, and with a hearty affection, they wou'd never have dream'd of restraining each other by these rules;