F. Scott Fitzgerald 
The Great Gatsby [EPUB ebook] 

In my younger and more vulnerable years my father gave me some advice that I’ve been turning over in my mind ever since.
‘Whenever you feel like criticizing anyone, ‘ he told me, ‘just remember that all the people in this world haven’t had the advantages that you’ve had.’
He didn’t say any more, but we’ve always been unusually communicative in a reserved way, and I understood that he meant a great deal more than that. In consequence, I’m inclined to reserve all judgements, a habit that has opened up many curious natures to me and also made me the victim of not a few veteran bores. The abnormal mind is quick to detect and attach itself to this quality when it appears in a normal person, and so it came about that in college I was unjustly accused of being a politician, because I was privy to the secret griefs of wild, unknown men