The Bhagavad-Gita quote connects to Holden because he lives life by his own rules. He doesn't let other people influence him. Many people are fake to him because they are all the same, they don't venture out and be their own person. My understanding of the quote is it is better to live your own life, no matter how many mistakes you make, than to conform and live how you are expected to. "One of the biggest reasons I left Elkton Hills was because I was
surrounded by phonies. That's all. They were coming in the goddam
window." He then goes on and talks about his principle, how he would only talk to the 'normal' or 'rich-looking' parents. Also, Holden doesn't seem to care about what others think of him. This is shown when he forgot all the equipment on the train, but he thought it was funny. This quote also fits Holden because he thinks if you die, but lived your own life according to your own rules, then you have lived successfully.
One of my favorite quotes is "Be who you are and say what you feel because those that mind don't matter and those who matter don't mind" -Dr. Seuss. I think this connects to Holden because Holden doesn't care what people think about him. He is going to be himself no matter what. And the people in his life, like Jane, his sister, and Allie, who accept him for who he is. Being who you are is something I think is very important to Holden because he is always surrounded by phonies. So how do you know if people will really like you for who you are if you are not yourself 100% of the time?