Friedrich Schiller

The glorious victory of Gustavus Adolphus had effected a great change in the conduct of that monarch, and in the opinion which both his friends and his enemies entertained of him. He had confronted himself with the greatest general of the age, and by the force of his tactics and Swedish valour, conquered the Imperial troops, the best in Europe. From that instant he relied upon himself, and self-reliance has ever been the, parent of great actions. Had not Alexander's impetuosity triumphed upon the Granicus, never had that conqueror overturned the Persian empire.

The History of the Thirty Years' War