All the same, the fundamental truths which govern that art are still unchangeable; just as the principles of mechanics must always govern architecture, whether the building be made of wood, stone, iron or concrete; just as the principles of harmony govern music of whatever kind. It is still necessary, then, to establish the principles of war.
Ferdinand FochThe fundamental qualities for good execution of a plan is first; intelligence; then discernment and judgment, which enable one to recognize the best method as to attain it; the singleness of purpose; and, lastly, . . . stubborn will.
Ferdinand Foch