‘This opinion of the impossibility of acquiring those beauties, which stamp the work with the character of genius, supposes that it is something more fixed than in reality it is; and that we always do and ever did agree in opinion, with respect to what should be considered as the characteristick of genius. But the truth is, that the _degree_ of excellence which proclaims _Genius_ is different in different times and different places; and what shows it to be so is, that mankind have often changed their opinion upon this matter. ‘When the Arts were in their infancy, the power of merely drawing the likeness of any object, was considered as one of its greatest efforts. The common people, ignorant of the principles of art, talk the same language even to this day. But when it was found that every man could be taught to do this, and a great deal more, merely by the observance of certain precepts; the name of Genius then shifted its application, and was given only to him who added the peculiar character of the object he represented; to him who had invention, expression, grace, or dignity, in short, those qualities or excellencies, the power of producing which could not _then_ be taught by any known and promulgated rules. ‘We are very sure that the beauty of form, the expression of the passions, the art of composition, even the power of giving a general air of grandeur to a work, is at present very much under the dominion of rules. These excellencies were heretofore considered merely as the effects of genius; and justly, if genius is not taken for inspiration, but as the effect of close observation and experience.’—THE SIXTH DISCOURSE, Vol. I. p. 153.