Honestly I've never understood this bit of wisdom that well but I think it means something like, don't take things for granted. Like if someone is like, hey friend, I would love to take you out to dinner tonight, to my favorite restaurant, it would mean the world to me if you came, you mean so much to me, don't ask: where is the restaurant? Let me look it up on yelp first.
Like I guess looking a gift horse in the mouth would be like
I mean you see where the conflict would arise in this situation. It's like insulting someone for having the gall to offer you something. It's like demonstrating in an extremely obvious and transparent way that you do not trust that person.
But of course you don't mean that latter friend because this person is by this point not your friend anymore, if they ever were. You know?
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