A man will fight harder for his interests than for his rights. Men are moved by only two mechanisms: fear and self-interest. Victory belongs to the most persevering.
Read over and over again the campaigns of Alexander, Hannibal, Caesar, Gustavus, Turenne, Eugene and Frederic. ... This is the only way to become a great general and master the secrets of the art of war.
Men have their virtues and their vices, their heroisms and their perversities; men are neither wholly good nor wholly bad, but possess and practice all that there is of good and bad here below. Such is the general rule. Temperament, education, the accidents of life, are modifying factors. Outside of this, everything is ordered arrangement, everything is chance. Such has been my rule of expectation and it has usually brought me success.