The thing about unattributed quotes is that one can only look at the words; the reputation of the person who made the comment is out of the question. Thus, somebody you don't like and who would have normally been dismissed out of hand can be allowed to say something that you consider to be wise and meaningful. You are allowing yourself to benefit from the thought conveyed alone and not letting your prejudices to get in the way. With that in mind, here are some more.
"There are things to see but more importantly things to think."
"If you were somebody else, would you be jealous of who you are?"
"He was, what they call, a 'self-made man'. Had he known where all the bits belonged, he would have made a much better man of himself."
"I have successfully avoided the burdens and distractions of success by avoiding the attainment of what others erroneously think success to be."