[entruil]

https://en.wikipedia.org/wiki/Joel_Feinberg

In the final argument, Feinberg sees a paradox. The only way to achieve happiness, he believes, is to forget about it, but psychological egoists hold that all human endeavour, even that which achieves happiness, is geared towards happiness. Feinberg poses a thought experiment in which a character named Jones is apathetic about all but the pursuit of his own happiness. Because he has no means to achieve that end, however, "[i]t takes little imagination [...] to see that Jones's one desire is bound to be frustrated."[15] To pursue only happiness, then, is to fail utterly to achieve it.