Psalm 140

Well. Ps. 140 is one of those psalms where David is just asking God to kill his enemies. You know the ones. Usually ones I skip over. 
But then I got to this line.

May burning coals fall on them

There was that guy that taught us to feed, give drink, (forgive maybe) someone, and this would heap burning coals on them.
To do something for someone that they don't deserve. This brought my mind directly to forgiveness because personally that's where my heart went. I have no idea where yours might go, but know that God is calling you to heap burning coals on someone's head.

But in His way. Not yours.