"Good is the passive that obeys Reason. Evil is the active springing
from Energy."

Unless Blake means that "Evil is entropy and good is using reason and effort to postpone it," and there is a case to be made for for that point of view. I haven't a clue either frogprince. And with that I am grasping at metaphoric straws.

I do get the part about Heaven and Hell being necessary opposites though.