Dronacharya was the teacher of both the Pandavas & the Kauravas. Arjuna was indeed the best among all & hence very dear to his Guru Drona. During a class, Dronacharya was telling them about the power of mantras. When one invokes Lord Varuna (God of water) and leaves an arrow, it becomes Varun-astra bringing rain. Similarly, when Lord Agni (God of fire) is invoked by the relevant mantra, the arrow becomes Agni-astra.

Since these mantras were taught to all, Arjuna had a doubt whether their concentration was good enough to invoke the powers of the mantra when chanted. To remove the doubt of the student and to test their ability, Dronacharya decides to have a test.
He asks all his students to take pots which are sealed and fill them with water. Each pot only had a small hole – the size of a pepper. The winner would be the one who fills the pot with water first.

All of them took sealed pots and went to a nearby lake to fill it with water. Inspite of keeping the pot immersed for long, water hardly entered the pot. Arjuna’s pot also remained almost empty. He then realized that his Guru had taught him the mantra to invoke Lord Varuna and if Lord Varuna is invoked the pot would get filled automatically. Arjuna chanted the relevant mantra in order to fill the pot and the pot became filled.

All the other Pandavas & Kauravas returned back disappointed. When Dronacharya asked Arjuna about his pot, he brought the pot filled with water and told his Guru that he had invoked Lord Varuna to fill the pot.
Dronacharya being pleased asked all the others to follow the discipline and to put in effort like Arjuna.

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[PS: I request all to please forward and share these value based stories rich in our culture and tradition to elders, youth and children]