All this can be seen and understood through this root. Initially it was the root of evil in the sense of actual evil. In other words, if evil carries out the evil incitement that is within its power, this is called actual evil. But when it is evil in its intrinsic nature yet it contains within it that which rectifies it – in the sense that it can no longer do evil – this is called evil that has reverted to good, because it has literally changed its function.
Initially it was actual evil inasmuch as its own intrinsic nature was such that wherever it was found, it obstructed the flow of blessing and sustenance. However, when it reverts to good, it greatly increases the flow of sustenance and blessing in the place where it is found, and the flow of sustenance is in proportion to the intensity of the original evil. (The revelation of His unity is all the greater and the stature of those who choose good is enhanced.)