Here we go again: looking for "success" cargo-cult signals, now with more "science!" to demand "evidence" from every unscientific/ambiguous/difficult-to-measure area and facet of life and reality, rather than improving fundamentals for increasing chances in something that has a good deal of probability involved. Felix Dennis wrote about this for a good chapter or so in his book with the ironic name: "How to Get Rich." I would consider the words of a billionaire to carry slightly-more weight than those of self-help gurus or thin, soundbite blog posts.
Effort / "working-hard" has no value unless it is effectively directed at something.
Effort / "working-hard" has no value unless it is effectively directed at something.