Not to add to the words of the good rabbi, but perhaps what He said could be interpreted as:

"what good is it to gain control of the whole world, yet forfeit control of your own soul?"

Power corrupts the soul, causes people to do things they never would have thought they'd do, all to gain and maintain control of the people and environment around them, yet they themselves have lost any peace in their soul, to mind their own business and prosperity. And in the end, their soul is useless as chaff, to be burned in the eternal fire.