‘This impression is the result of the accumulated experience of our whole life, and has been collected, we do not always know how, or when. But this mass of collective observation, however acquired, ought to prevail over that reason, which, however powerfully exerted on any particular occasion, will probably comprehend but a partial view of the subject; and our conduct in life, as well as in the arts, is or ought to be generally governed by this habitual reason: it is our happiness that we are enabled to draw on such funds. If we were obliged to enter into a theoretical deliberation on every occasion before we act, life would be at a stand, and Art would be impracticable. ‘It appears to me therefore’ (continues Sir Joshua) ‘that our first thoughts, that is, the effect which any thing produces on our minds, on its first appearance, is never to be forgotten; and it demands for that reason, because it is the first, to be laid up with care. If this be not done, the artist may happen to impose on himself by partial reasoning; by a cold consideration of those animated thoughts which proceed, not perhaps from caprice or rashness (as he may afterwards conceit), but from the fulness of his mind, enriched with the copious stores of all the various inventions which he had ever seen, or had ever passed in his mind. These ideas are infused into his design, without any conscious effort; but if he be not on his guard, he may reconsider and correct them, till the whole matter is reduced to a common-place invention. ‘This is sometimes the effect of what I mean to caution you against; that is to say, an unfounded distrust of the imagination and feeling, in favour of narrow, partial, confined, argumentative theories, and of principles that seem to apply to the design in hand; without considering those general impressions on the fancy in which real principles of _sound reason_, and of much more weight and importance, are involved, and, as it were, lie hid under the appearance of a sort of vulgar sentiment. Reason, without doubt, must ultimately determine every thing; at this minute it is required to inform us when that very reason is to give way to feeling.’—Discourse XIII. vol. ii. p. 113–17. Mr. Burke, by whom the foregoing train of thinking was probably suggested, has insisted on the same thing, and made rather a perverse use of it in several parts of his Reflections on the French Revolution; and Windham in one of his Speeches has clenched it into an aphorism—‘There is nothing so true as habit.’ Once more I would say, common sense is tacit reason. Conscience is the same tacit sense of right and wrong, or the impression of our moral experience and moral apprehensions on the mind, which, because it works unseen, yet certainly, we suppose to be an instinct, implanted in the mind; as we sometimes attribute the violent operations of our passions, of which we can neither trace the source nor assign the reason, to the instigation of the Devil!