Not

“Folks are usually about as happy as they make their minds up to be.”
― Abraham Lincoln

“In three words I can sum up everything I've learned about life: it goes on.”
― Robert Frost

“Most people are other people. Their thoughts are someone else's opinions, their lives a mimicry, their passions a quotation.”
― Oscar Wilde, De Profundis

“If a man will begin with certainties, he shall end in doubts; but if he will be content to begin with doubts, he shall end in certainties.”
― Francis Bacon, The Oxford Francis Bacon IV: The Advancement of Learning