The Greatest Power in the World Comes From the Inside Out

You must get inside his or her way of thinking, not as an exercise in sensitivity, but out of strategic necessity. Only by knowing your enemies can you ever hope to vanquish them. The leaders who have made best use of intelligence were all first and foremost, great students of human nature and superior readers of men. They honed their skills through personal observation of people. only with that foundation could the use of spies extend their powers of vision.