Full Idea
If good frequently comes out of evil, the converse fact, evil coming out of good, is equally common.
Gist of Idea
Evil comes from good just as often as good comes from evil
Source
John Stuart Mill (Nature and Utility of Religion [1874], p.117)
Book Reference
'The Existence of God', ed/tr. Hick,John [Macmillan 1964], p.117
A Reaction
Mill surmises that on the whole good comes from good, and evil from evil, but the point is that the evidence doesn't favour the production of increased good.