He spoke at my commencement with a a paraphrase of that and it's always stuck with me. Also led me to read most of his books!
https://commencement.me/kurt-vonnegut-at-rice-university-199...
So what does this Methuselah have to say to you, since he has lived so long? I’ll pass on to you what another Methuselah said to me. He’s Joe Heller, author, as you know, of Catch 22. We were at a party thrown by a multi-billionaire out on Long Island, and I said, “Joe, how does it make you feel to realize that only yesterday our host probably made more money than Catch 22, one of the most popular books of all time, has grossed world-wide over the past forty years?”
Joe said to me, “I have something he can never have.”
I said, “What’s that, Joe?”
And he said, “The knowledge that I’ve got enough.”
His example may be of comfort to many of you Adams and Eves, who in later years will have to admit that something has gone terribly wrong — and that, despite the education you received here, you have somehow failed to become billionaires.