When, in spite of the combination of traitors and loyal persons, success is achieved, it is mixed success; when people are thus mixed, success is to be achieved through the agency of loyal persons; for in the absence of a support, nothing that requires a support for its existence can exist. When success is involved in the union of friends and enemies it is termed a success contaminated by an enemy; when success is contaminated by an enemy, it is to be achieved through the agency of a friend; for it is easy to attain success through a friend, but not through an enemy.