The power of "can't": The word "can't" makes strong people weak, blinds people who can see, saddens happy people, turns brave people into cowards, robs a genius of their brilliance, causes rich people to think poorly, and limits the achievements of that great person living inside us all.
I think the first virtue is to restrain the tongue; he approaches nearest to gods who knows how to be silent, even though he is in the right.