Date: 1686, 1689, 1697

"'Tis so many times in the capacities of Youth: they who can receive any impression like the Virgin-wax, will as easily suffer a defacement unless it be hardned and matur'd by Time: whereas others who are hard to be wrought upon like Steel, retain the Images which are Engraven on them with much m...

— Nourse, Timothy (c.1636–1699)

Date: January 1739

"On the other hand, impressions and passions are susceptible of an entire union, and, like colours, may be blended so perfectly together, that each of them may lose itself, and contribute only to vary that uniform impression which arises from the whole."

— Hume, David (1711-1776)

Date: 1751

"Tho' an impression is made upon the mind, by means of the image painted upon the retina, whereby the external object is perceived; yet nature has carefully concealed this impression from us, in order to remove all ambiguity, and to give us a distinct feeling of the object itself, and of that only."

— Home, Henry, Lord Kames (1696-1782)