Steven Pressfield said this quote

“ War, not peace, produces virtue. War, not peace, purges vice. War, and preparation for war, call forth all that is noble and honorable in a man. It unites him with his brothers and binds them in selfless love, eradicating in the crucible of necessity all which is base and ignoble. There in the holy mill of murder the meanest of men may seek and find that part of himself, concealed beneath the corrupt, which shines forth brilliant and virtuous, worthy of honor before the gods. Do not despise war, my young friend, nor delude yourself that mercy and compassion are virtues superior to andreia, to manly valor. ”