He sets a great example for how couples can treat each other: To reach across a chasm with words and an offered hand.
We can be the instigator of healing and connecting locally and in our immediate family. We can learn from Mandela to be the best friend, mother/father, husband/wife, sister/brother, co-worker/volunteer as we are able to reach for more within ourselves. This is not about being perfect. This is full-heartedness.
Read about Nelson Mandela, and experiment with embodying healing in your own relationship. Be the one to say, "That didn't go very well. Let's try again."