Please imagine someone is dealing with a very difficult challenge in their lives and you as the second person who is watching everything from afar and is outside of the matter just say: you have to do lalala or you shouldn't do ...
There is a proverb in my mother language which says:
[Direct translation]: He stands on the side of the pit and says: “through him down!”.
Meaning that it is not his / her problem, so he doesn't have any idea how difficult it can be! So, just orders doing... because has no idea about the challenge.
I was wondering if you could let me if there is an equivalent for this proverb in English at all or there isn't.