“It was this intense self-discipline and objectivity that allowed Rockefeller to seize advantage from obstacle after obstacle in his life, during the Civil War, and the panics of 1873, 1907, and 1929. As he once put it: He was inclined to see the opportunity in every disaster. To that we could add: He had the strength to resist temptation or excitement, no matter how seductive, no matter the situation. Within twenty years of that first crisis, Rockefeller would alone control 90 percent of the oil market. His greedy competitors had perished. His nervous colleagues had sold their shares and left the business. His weak-hearted doubters had missed out.”