“See the good in that which is evil, and the evil in that which is good.”
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Hayao Miyazaki 34
Japanese animator, film director, and mangaka 1941Related quotes
“Is there worse evil than that which goes in the mask of good?”
Source: The Chronicles of Prydain (1964–1968), Book V : The High King (1968), Chapter 11 (p. 142)

De Potentia (On Power) q. 3, art. 6, ad 4

“That which is done out of love is always beyond good and evil.”

On Virginity 6.1
[Harrison, Carol, Truth in a Heresy?, The Expository Times, 2016, 112, 3, 78–82, 10.1177/001452460011200302]
On Virginity

infinity plus interview (2001)
Variant: In real life, the hardest aspect of the battle between good and evil is determining which is which.
Context: The battle between good and evil is a legitimate theme for a Fantasy (or for any work of fiction, for that matter), but in real life that battle is fought chiefly in the individual human heart. Too many contemporary Fantasies take the easy way out by externalizing the struggle, so the heroic protagonists need only smite the evil minions of the dark power to win the day. And you can tell the evil minions, because they're inevitably ugly and they all wear black.
I wanted to stand much of that on its head.
In real life, the hardest aspect of the battle between good and evil is determining which is which.

http://www.baen.com/library/palaver4.htm
Attributed

“Any institution which does not suppose the people good, and the magistrate corruptible, is evil.”
Original French: Tout institution qui ne suppose pas le peuple bon et le magistrat corruptible est vicieuse.
From article 19 of the Déclaration des droits de l'homme et du citoyen http://saintjust.free.fr/DDHC93.htm (21 April 1793)
Original: XIX Tout institution qui ne suppose pas le peuple bon et le magistrat corruptible est vicieuse.