On the Sublime and Beautiful/Part II/Chapter 12
INFINITY, though of another kind, causes much of our pleasure in agreeable, as well as of our delight in sublime, images. The spring is the pleasantest of the seasons; and the young of most animals, though far from being completely fashioned, afford a more agreeable sensation than the full-grown; because the imagination is entertained with the promise of something more, and does not acquiesce in the present object of the sense. In unfinished sketches of drawing, I have often seen something which pleased me beyond the best finishing; and this I believe proceeds from the cause I have just now assigned.