Cracks and light

"He'd made a crayon sketch of his own body in the form of a vase with a deep black crack running through it. ...Several years later, he ran his finger along the crack, saying, 'You see here, this is where the light comes through.' With a yellow crayon, he drew light streaming through the crack into the body of the vase and said, 'Our hearts can grow strong at the broken places'."
Jack Kornfield, A Path with Heart