This question came to me while I was reading Gita and trying to find out meaning of each word. His elder brother, Yudhisthira was best among all and was known as “dharam raj” why Krishna gave Arjuna the knowledge of Gita.
The first thing my mind told me to observe is the name of all brothers.
Yudhishitra means who is stable in battlefield. He is the symbol of peace and referred as sky.
Bhima means terrible, who can destory universe. He is the symbol of life force and referred as breath.
Arjuna means free from all bonds. He is the symbol of power which destroys ignorance and referred as fire.
Nakula means a river without bank. He is the symbol of freely flowing energy used in reproduction and referred as endless flow of water.
Sahadeva means enquiring attitude . He is the symbol of “knowing” and referred as earth.
After comparing all these name meanings I came to a conclusion that Arjuna is the best person who in his true sense can understand the meaning of Krishna which he gave through “Gita”. One thing to note is, neither of the other four brothers will ever feel sad while killing their relatives or feel sad in battlefield. It was Arjua to whom such question and feeling came. Only Arjuna can cut the bonds, free his soul, mind and thoughts to show 100% commitment towards his “dharma” and “karma”. He has focused mind and so it was easy for him to understand and focus on what Krishna wanted to tell him, wanted him to understand.
It was only Arjuna who had the power to understand the words of Krisha, the symbols of Bhagvada Gita. If Yudhishtira would be there to ask Krishna questions like Arjuna would he be able to ask the correct questions? I doubt. He would have more focused on What is Dharma and what according to Dharma needs to be done. In the name of Dharma you cannot ignore Karma or deny Karma. As with what you say, what you do, how you say, how you do, you build your karma.
With this meaning I learned in oneself there should be an element of Arjuna, who burns fire of questions and always ready to gain knowledge.