Diplomacy and an astute persona grataDiplomacy is a tool used to get planning, proposal, demand accepted by opponent or other party by using all means and stratagem- by hook or by crook. A wily and pragmatic diplomat endowed with intelligence, shrewdness, unfumbleness, grit, guts, rhetoric skills is he who despite being wrong compels his opponent to accede to what he offers to him. In other words he knows how to befool others and interesting point is that the opponent who is fooled, sometimes, is well aware of being fooled but artificial bars erected around him makes him succumb to maneuvering of the diplomat.
Diplomacy works at every level whether it's the matter of bitter relations between countries or business empires or even common people. A persona grata who has power, money, influential status is more likely to be advantageous and mostly succeed to get his mission completed.
(My entry for TOW - Diplomacy)