Page:The Works of John Locke - 1823 - vol 01.djvu/20

xiv is in truth the shortest and safest way of proceeding for such self-taught philosophers, and saves a deal of trouble in seeking reasons for what they advance, where none are to be found. Mr. Locke went a far different way to work, at the very entrance on his Essay, pointing out the true origin of all our passions and affections, i. e. sensitive pleasure and pain; and accordingly directing us to the proper principle and end of virtue, private happiness, in each individual; as well as laying down the adequate rule and only solid ground of moral obligation, the divine will. From whence also it may well be concluded that moral propositions are equally capable of certainty, and that such certainty is equally reducible to strict demonstration here as in other sciences, since they consist of the very same kind of ideas, [viz. general abstract ones, the true and only ground of all general knowledge]; provided always that the terms be once clearly settled, in which lies the chief difficulty, and are constantly applied (as surely they may be) with equal steadiness and precision: which was undoubtedly Mr. Locke's meaning in that assertion of his which drew upon him so many solicitations to set about such a systematic demonstration of morals.

In the same plain and popular introduction, when he has been proving that men think not always, [a position which, as he observes, letter to Molyneux, August 4, 1696, was then admitted in a commencement act at Cambridge for probable, and which few there now-a-days are found weak enough to question] how come we not to attend him through the genuine consequences of that proof? This would soon let us into the true nature of the human constitution, and enable us to determine whether thought, when every mode of it is suspended, though but for an hour, can be deemed an essential property of our immaterial principle, or mind, and as such inseparable from some imaginary substance, or substratum, [words, by the by, so far as they have a meaning, taken entirely