It doesn’t matter if you have a genius IQ and a PhD in Quantum Physics, you can’t change anything or make any sort of real-world progress without taking action. There’s a huge difference between knowing how to do something and actually doing it. Knowledge and intelligence are both useless without action. It’s as simple as that.
Successful people know that a good plan executed today is better than a perfect plan executed someday. They don’t wait for the “right time” or the “right day” or the “right (impossible) circumstances”, because they know these reactions are based on a fear and nothing more. They take action here and now, today – because that’s where real progress happens.