You are forgetting the great part about quotes: "The thing about quotes on the internet is that you cannot confirm their validity."-- Abraham Lincoln Rarely do people question the reality of the who said what where and when of a "quote". It is an assertion in the fiction of human reality that we create to solidify our place in the world.
http://quoteinvestigator.com/2010/05/04/universe-einstein/ hi psulli, I just happened across this great website while seeking to have a quote verified. I was looking up Einstein's alleged quote "only two things are infinite, the universe and human stupidity, and I'm not that sure about the universe." The quote investigator dug quite deep.
nicely put, Psulli - I checked Lincoln's quote and found a reference to it in a footnote to the Emancipation Proclamation and retweeted in the Gettysberg Address 10 months later. by the way, I check original sources of quotations. Secondary sources tend to have multiple variants.