1911 Encyclopædia Britannica, Volume 14… (1911)
“ Difference in intensity is not a wholly satisfactory ground of distinction; abnormal physical conditions apart, an image may have an intensity far greater than that of a sense-given impression. On the other hand, Hume is certainly right in holding that the distinctive character of a percept as compared with an image is in all ordinary cases the force and liveliness with which it strikes the mind—the distinction, therefore, being one of quality, not of degree. ”
