The great mobility of the King forms one of the chief characteristics of all endgame strategy. In the middlegame the King is a mere 'super', in the endgame on the other hand - on of the 'principals'. We must therefore develop him, bring him nearer to the fighting line.
Aron NimzowitschIf in a battle, I seize a bit of debatable land with a handful of soldiers, without having done anything to prevent an enemy bombardment of the position, would it ever occur to me to speak of a conquest of the terrain in question? Obviously not. Then why should I do so in chess?
Aron Nimzowitsch