Your heart is here

Even though I cannot see you, I am certain that your heart is here. If you find that you miss me, always look at the sun that rises [in the morning] and the moon that rises in the evening. I will be reflected in the sun and the moon. And in our next life, let us meet in the pure land of Eagle Peak. Nam-myoho-renge-kyo. 16/6

The Writings of Nichiren Daishonin
Letter to the Lay Nun of Ko
Written to the lay nun of Ko on June 16, 1275