Isaiah 27:5 Or else let them come to me for refuge; let them make peace with me, yes, let them make peace with me.
Mercy and forgiveness are traits which are central to our Christian ways and something Christ Himself showed in abundance throughout His life on earth.
These are not things introduced by Christ but things demonstrated by Him which God has been trying to get into our heads for quite a while!
We may not want people who have wronged us to come back into our lives; Christ is using us to reach out to them and allow them to see how great His forgiveness can be!