Disobedience is darkness
“Obedience to (Allaah and His Messenger) is a light and disobedience is darkness.
And whenever the darkness becomes more immense, straying increases until (the person) falls into bidah, affairs of misguidance and destruction, whilst he does not know;–similar to a blind man who comes out in the darkness of night and walking by himself.”
— Ibn Al Qayyim (rahimahullaah) [Al-Jawaab Al-Kaafee, pg. 13]