Steven Pressfield shared this in his excellent series on The Warrior Ethos:
"There’s a well-known gunnery sergeant in the Marine Corps who explains to his young Marines, when they complain about pay, that they get two kinds of salary—a financial salary and a psychological salary. The financial salary is indeed meager. But the psychological salary? Pride, honor, integrity, the chance to be part of a corps with a history of service, valor, glory; to have friends who would sacrifice their lives for you, as you would for them—and to know that you remain a part of this brotherhood as long as you live. How much is that worth?" (See The Warrior Ethos)
Semper Fi, Marine warriors!