Take the full happiness of life, the happiness of serving, loving, befriending, and defending – the happiness of fighting and conquering all that is difficult or dangerous or devilish, whether in men or circumstances. Play games, for recreation, but not too seriously, because when they are serious they are neither quite games nor quite the real thing. The real thing is mastery, the power to use the world and all its resources, and hand it on improved to those who come after you. One joy of this mastery is what is called sport – the joy of pitting your courage, your endurance, or your skill against others, men, animals, or mechanisms; better still if it is team work, and best of all if it is the great hazard of life and death, in the service of a cause that is worth a man's life. To gain this mastery, to fit yourself for such a service, you must accept the training offered you, and you must help to train yourself; learn to do everything that man can do […] learn the lives and the adventures of great men, and the thoughts and feelings they have recorded in their books; learn to be a man yourself, not a half-developed or lop-sided creature, but a man full grown, full of all life that can be got from men and spent for men again.