There have to have been a whole passel of “divine moments of truth” in the face of this. It’s rooted in a promise of God through the bible. In Old Testament, when the power of darkness comes in like a flood, the Lord will raise up a standard. In New Testament, where sin abounded, grace superabounded.
It has also resulted in Christians being pressed on to higher levels than they had ever dreamed of being. Grace often doesn’t arrive in a vacuum, but in the face of the worst enemy assaults we know.