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.
A commander-in-chief cannot take as an excuse for his mistakes in warfare an order given by his sovereign or his minister when the person giving the order is absent from the field of operations and is imperfectly aware or wholly unaware of the latest state of affairs. It follows that any commander-in-chief who undertakes to carry out a plan which he considers defective is at fault; he must put forward his reasons, insist on the plan being changed, and finally tender his resignation rather than be the instrument of his army's downfall.
I hope the time is not far off when I shall be able to unite all the wise and educated men of all the countries and establish a uniform regime based on the principles of the Quran which alone are true and which alone can lead men to happiness.
Lead the ideas of your time and they will accompany and support you; fall behind them and they drag you along with them; oppose them and they will overwhelm you.