Quotation, Sir, is a good thing; there is a community of mind in it : classical quotation is the parole of literary men all over the world.
Source, in full
Remark to Wilkes (1781); quoted in: Tryon Edwards (1853) The World's Laconics: Or, The Best Thoughts of the Best Authors. p. 232; Highlighted section als in Hoyt's New Cyclopedia Of Practical Quotations (1922), p. 653-54.