A real love letter is made of insight, understanding, and compassion. Otherwise it's not a love letter. A true love letter can produce a transformation in the other person, and therefore in the world. But before it produces a transformation in the other person, it has to produce a transformation within us. Some letters may take the whole of our lifetime to write.
Thich Nhat Hanh (2011). “Your True Home: The Everyday Wisdom of Thich Nhat Hanh: 365 days of practical, powerful teaching s from the beloved Zen teacher”, p.24, Shambhala Publications
