 अत्येति रजनी या तु सा न प्रतिनिवर्तते।यात्येव यमुना पूर्णा समुद्रमुदकाकुलम्।। 
 A night that once passe off does not return like the waters of river Yamuna that flow into the ocean filled with water the water do not flow back into Yamuna. 