My point was that the saying itself is wrong and a bad meme (the ethics of it were secondary to my argument) and I linked to where it originated to show that it wasn't even a thing in the first place.

Explaining the meaning of a bad meme is not interesting but if you are still asking what it is supposed to mean then here goes:

The first half is obvious because it is a tautology. It states that "An X is an X."

The second half implies that unhappiness pushes one to become a philosopher because they start thinking about how they became unhappy. Why? Who knows. Most unhappy people do not become philosophers, but some might. Also, gender and being married or not have nothing to do with becoming a philosopher.

You are correct that it's confusing why the implication should go without saying. It's because it doesn't. It's a simplified rewording and further generalization of a misattributed misquote meme that is itself a generalization and mischaracterization of a dialogue line of a philosopher describing his own situation and his own choices.