i personally think quotes are one of the best ways to understand thinks that cut to the heart, are simple, and help growth if tooken quite seriously.
i have a few of my favorite that i have found so far and hope you guys will add great ones here (even though ranked all are quite equal to me). i also personally believe the source of the quote isn't always needed, just the message but will post them anyways.
#1 "be a light unto yourself"
#2 “as a man thinketh in his heart, so is he”
#3 "love is law and law is love"
#4 "what has been is what will be and what has been done is what will be done there is nothing new under the sun"
-solomon? ecclesiastes - the bible