It is made perfectly clear that if we do not forgive we shall not be forgiven. There are no two ways about it. What are we to do?… One might start with forgiving one’s husband or wife, parents, children or friends for something they have done or said in the last week. That will probably keep us busy for the moment. And secondly, we try to understand exactly what loving your neighbour means. I have to love him as I love myself.

A Year with C.S. Lewis, “Mere Christianity”, Ed. Patricia S. Klein, San Francisco: Harper, 2003, p. 231.