It is to be borne in mind, however, that certain beings who fell away from that one beginning of which we have spoken, have sunk to such a depth of unworthiness and wickedness as to be deemed altogether undeserving of that training and instruction by which the human race, while in the flesh, are trained and instructed with the assistance of the heavenly powers; and continue, on the contrary, in a state of enmity and opposition to those who are receiving this instruction and teaching. And hence it is that the whole of this mortal life is full of struggles and trials, caused by the opposition and enmity of those who fell from a better condition without at all looking back, and who are called the devil and his angels, and the other orders of evil, which the apostle classed among the opposing powers. (Book I, Chapter 6, Part 3)

The issue is not so much the evil done, nor even active opposition of the Good.

The crucial choice is to not look back, losing the ability to doubt one's own motives.

The devil and his angels are lost not by what they do, but by failing to question what they do.

I don't know that my struggles can be blamed on the so-called opposing powers. I am inclined to think I do badly enough without their help.

I do know that questioning, doubting, and self-criticism are another kind of wonderful trinity.

The image is of Satan exulting over Eve by William Blake.