To be fair, many many authors have posted books of their own aphorisms while still alive. For exmaple Nietzsche, Cioran, de La Rochefoucauld, et al.
See this wikipedia page for a list of all such authors: https://en.wikipedia.org/wiki/Aphorism
See this wikipedia page for a list of all such authors: https://en.wikipedia.org/wiki/Aphorism