I doubt if it is given to the human being to understand completely the blessed passion and precious death, the mighty resurrection and glorious ascension of our Lord Jesus Christ. I know that I do not understand. But I also know that it has nothing to do with the angry unforgiving God who so upset my young friend. If the basic definition of sin is lack of love (that love without which all men are dead in the sight of God, as Cranmer wrote in one of his collects), then an inability to forgive is lack of love, and if God is unable to forgive us then he is lacking in love, and so he is not God. At least, he is not the God who makes glad my heart.