There was a Rishi called Aayod Dhaumya in the ancient India. Many disciples (or students) used to stay in his clean & pure Ashram (school). One of them was Aaruni, very polite, good at serving & helping others & enthusiast in following the commands of Gurudev. Once it was raining very heavily. Guruji sent Aaruni to take care of the farms of the ashram. Aaruni went & saw that water had partially ruined the boundaries of the farm & was rapidly flowing out of the farm. Soon it would destroy the complete boundary & the whole of water would flow out.

Aaruni made brave efforts. He quickly started putting lots of mud on the broken boundary. But the turbulence of water would wash away all the mud. Atlast Aaruni himself lay on the broken boundary to stop the flow of water. His body was able to resist the flow of water, but he kept lying in the cold water for the whole of night. Thus he took full care of the farm.

It was morning now. When all the disciples went to bow to Guruji then Aaruni was no where to be found. Gurudev went towards the farm with other disciples in search of Aaruni.

"Aaruni! Aaruni... !!"

Aaruni heard the voice of Guruji. His body was shivering due to cold & his voice was supressed. Even then he got up & bowed to Guruji & said: "At your humble service, Gurudev?"

Guru Aayod Dhaumya's heart was overwhelmed with joy. Seeing the dedication of the disciple, his heart was overflowing with divine blessings. Lighting the candle of knowledge in the heart of Aaruni he said:

"Son! You shall become an expert in all Shastra even without studying."

By having true dedication towards Guru, the knowledge of Shastra started developing in the mind of Aaruni on its own. Guru named him Udyalak. Great is the devotion of Aaruni towards Gurudev!