Of what evil is God speaking in Is. 45:7 when he says: “I make peace and create evil: I the Lord that do all these things”?
The difficulty is to understand in what way it can be said that God created evil, and is answered by St. Thomas Aquinas in the Summa Theologica, Ia, Q.49, A.2. It is interesting to see how he overcomes the ancient dualism of the Persians, the temptation which maintained that there were two principles, one of good and one of evil.