The phrase about "marrying an asset, not a liability" is literally about choosing a spouse.
Yes, and I wholeheartedly concur with it. So is it common or what? Yes, but it has absolutely nothing to do with investment.
Regarding its use in investing or trading contexts, now I recall that I often met this expression in the commodities section of investing.com (in the crude oil part, more specifically). But as you were trying to search it on Google, now I'm seriously doubting that it is me who is to expect future misunderstandings. Maybe, you are not as knowledgeable as you think you are, both trading and English language wise? No need to get all defensive, just in case
Interesting. If it's so common, why does Google turn up nothing? It endlessly crawls the internet indexing things that people actually say.
Kidding aside, searching the forum would suffice
Right, so literally one post in four years.
The other posts you quoted specified an investment/trade, which is exactly the point I just made. "Asset" doesn't clarify that. It doesn't specify either side of a trade, which is why it's not something people say.
Anyway, I have no idea how you managed to belabor this so much. My original point (which still stands) was simply that the asset doesn't matter, not one bit. Managing risk (and thus emotions) is what matters.