I don't understand what this article is trying to say. Whatever constraints exist certainly shape things, but they're not some success magic ... the fact that

I don't understand what this article is trying to say. Whatever constraints exist certainly shape things, but they're not some success magic ... the fact that they exist at all / in so many success stories isn't significant, constraints exist in life, including with success and failures. I also don't see "goals" and "constraints" as some weird opposite forces or concepts that conflict. Maybe I missed the whole idea here....