Dan Shechtman

If a man made himself an expert in any particular branch of human activity, there would result the strong tendency that a peculiar aptitude towards the same branch would be found among some of his descendants.

Did you know there's a difference between being busy and being fruitful? Did you ever stop to think that just being busy - running around in circles all day but not accomplishing anything - is the same as wasting your time? It's frustrating to expend so much energy and time and not have any fruit from your effort!