अत्येति रजनी यातु सा न प्रनिवर्तते ।
यत्येव यमुना पूर्णा समुद्रं लवणार्णवम् ॥
- रामायण अयोध्या
atyeti rajanI yAtu sA na pratinivartate ।
yAtyeva yamunA pUrNA samudram lavaNArNavam ॥
- rAmAyaNa, ayodhya
Night passes. It never comes back. Yamuna also flows forward towards the sea and becomes one with the sea (salty). It will never come back (it will not become sweet again). Time also passes and never comes back.
- Ramayana, Ayodhya