Question:
Romans 12:21.  What are some ways in which we might be overcome with evil?

Answer:

Someone said something that stuck in my mind: “The opposite of love is not hate.  The opposite of love is apathy.”  Based on this, not letting our light shine is one way of being overcome with evil.  In addition, whenever we are swallowed by vengeance or let selfishness rule our actions, we are not allowing good to reign in our bodies.  Again, since the opposite of love is apathy, simply doing nothing is a great way to be overcome with evil!