There can be nothing more inept than the people who suppose that good could have existed without the existence of evil.
 Bertrand Russell, A History of Western Philosophy (1945). copy citation

Context

“He is said to have considered that God has no share in the causation of evil, but it is not clear how he reconciled this with determinism. Elsewhere he deals with evil after the manner of Heraclitus, maintaining that opposites imply one another, and good without evil is logically impossible: “There can be nothing more inept than the people who suppose that good could have existed without the existence of evil. Good and evil being antithetical, both must needs subsist in opposition.” In support of this doctrine he appeals to Plato, not to Heraclitus. Chrysippus maintained that the good man is always happy and the bad man unhappy, and that the good man’s happiness differs in no way from God’s.” source