Another important reason to deepen your friendship with your lover is that you are more likely to be kind and loving toward someone you consider a friend. Friendship is an invitation to be kind and generous to both ourselves and our partners. When your lover is your friend, you understand that he or she was not put on earth just to make you happy. Your lover has as much right as you do to have personal habits and quirks. When we are truly friends with our partners, we show them goodwill and do not just expect to have goodwill shown to us.
— Dr. Fred Luskin, Forgive for Love, p. 154