The cloud and the cave.
“In the mountains of Vietnam, there are caves where many thousands of birds make their nests. In the early morning, the birds fly out to look for food to bring back for their young. Sometimes the mouth of the cave is obscured by a passing cloud and the birds cannot find their way home. Only when the bright light of the sun melts away the clouds can the birds see clearly the entrance to the cave and come home.”
— Thich Nhat Hanh, ‘The Other Shore: A New Translation of the Heart Sutra with Commentaries’