Fame is a vapor; popularity an accident; riches take wings; the only earthly certainty is oblivion ….
Horace Greeley (1881-1872) American newspaper editor, reformer, politician
Recollections of a Busy Life, ch. 18 (1868)
(Source)
Quoted by Mark Twain in his Notebook (1869), and often attributed to him. Frequently misquoted as "Fame is a vapor; popularity an accident; riches take wings; those who cheer today will curse tomorrow; only one thing endures: character." More discussion of this quotation here.