I found this quote online often attributed to either Tennessee Williams or a Babylon 5 episode:
There comes a time when you look into the mirror and you realize that what you see is all that you will ever be. And then you accept it. Or you kill yourself. Or you stop looking in mirrors.
I think the latter is more likely but also it could just be completely made up. The epsiode title is given as Chrysalis sometimes, e. g: on IMDB.
Thank you!
I know these things are random but I wonder how it ended up misattributed to Williams of all people...