Was good disguised,—why, out with one huge wipe
Goes knowledge from me. Type needs antitype:
As night needs day, as shine needs shade, so good
Needs evil: how were pity understood
Unless by pain? "A
A: Francis Furini.
Good and evil are relative to each other, and each is known only through its contrary.
"For me
(Patience, beseech you!) Knowledge can but be
Of good by knowledge of good's opposite—