Like a person who witnesses a crime and knows the right thing to do is report it but turns a blind eye, they have chosen darkness rather than light. (Ben Witherington III, The Indelible Image, pg 579)
Witherington is talking about those Pharisees who saw Christ, recognized Him as a miracle worker, but refused to do what was right:
Then Jesus told him, “I entered this world to render judgment– to give sight to the blind and to show those who think they see that they are blind.”
Some Pharisees who were standing nearby heard him and asked, “Are you saying we’re blind?”
“If you were blind, you wouldn’t be guilty,” Jesus replied. “But you remain guilty because you claim you can see. (John 9.39-41)
Can you imagine those who know to do good, but do not do it – what does that inaction, that passiveness become?