I make the point that most of us live in what I call tactical hell. We are constantly reacting to what others give us, managing the battles that confront us day in and day out. We rarely get control. Our minds become dominated by tactical thinking. We can only focus on details. We argue and nitpick about this battle or that battle. It is hell.
Strategy is a kind of mental ladder you climb to get above these battles, gain some perspective and plot your moves. It is a mental purgatory. Grand strategy is simply this idea taken further—gaining a perspective that encompasses months or years. It is incredibly liberating and powerful when you have clear idea of where you want to be in five years, or can focus on what you see as your destiny in life. It helps you manage your daily decisions. "It is not important I fight this battle because it does not serve my overall goals." On and on.
Grand strategy is heaven, one we rarely reach, but must always aim for. It is the ultimate form of rationality. The word is misused nowadays, and I try to correct this in the chapter. I wish everyone would read it. And it is my modest homage to the spirit of Sun-tzu.