Ramayana is an ancient Indian epic poem which narrates the struggle of the divine prince Rama to rescue his wife Sita from the demon king Ravana. Along with the Mahabharata, it forms the Hindu Itihasa.
The epic, traditionally ascribed to the Hindu Valmiki, narrates the life of Rama, the legendary prince of the Kosala Kingdom. It follows his fourteen-year exile to the forest from the kingdom, by his father King Dasharatha, on request of his third wife Kaikeyi. His travels across forests in India with his wife Sita and brother Lakshmana, the kidnapping of his wife by Ravana, the great king of Lanka, resulting in a war with him, and Rama’s eventual return to Ayodhya to be crowned king.
Here is a beautiful quote from Ramayana:
Like a flowing river, what has gone will never come back 5-20-12
Yadatitam punarnaiti srotah srotasvinaam iva