Barbarika was none other than the grandson of Bhima and Hidimba.
This lesson was engraved in his mind deeply & to fulfil this mission he performed austerities for years & obtained powerful weapons from various demi-gods
When Krishna did not approve of this, he told Krishna that he would kill Pandavas at once and was about to shoot a weapon at them. Immediately he was beheaded by Lord’s Sudarshan chakra
Then Barbarika offered prayers to the Lord & requested Krishna to allow him to watch the pastimes of the Lord in Mahabharat war.
The Lord granted him a spiritual vision. After watching the pastimes of the Lord -
When the Pandavas heard this from Barbarika, they were eager to know who fought more bravely in the war.
Barbarika replied – “In reality, NO ONE FOUGHT. Everywhere it was only Sudarshan chakra which was moving around
Many times in life when we are busy & involved in work, when we become experts in certain work, there is a danger that we start believing that we are the doers.