Aphorism, n.: A concise, clever statement you don’t think of until too late. – James Alexander Thom

Some lines are born quotations, some are made quotations, and some have “quotation” thrust upon them. – Gary Saul Morson, The Words of Others: From Quotations to Culture, 2011

I had continued jotting down good lines—once the eyes and ears are awakened to the possibilities they can’t be put back to sleep… – Robert Byrne, The Third and Possibly the Best 637 Best Things Anybody Ever Said,

I am wonderfully pleased when I meet with any passage in an old Greek or Latin author, that is not blown upon, and which I have never met with in any quotation. – Joseph Addison, Spectator, No.464