Bhagavad Gita Verse 59, Chapter 18

yadahankaaramaashritya na yotsya iti manyase |
mithyaisha vyavasaayaste prakritistvaam niyokshati || 59 ||
 
Relying on that egoism, you think - I will not fight. This determination of yours is wrong. Your nature will compel you.
 
yat : that
ahankaaram : egoism
aashritya : relying
na : not
yotsye : fight
iti : in this manner
manyase : think
mithyaa : wrong
esha : this
vyavasaayaha : determination
te : your
prakritihi : nature
tvaam : you
niyokshati : compel
 
Right at the beginning of the Mahaabhaarata war, when Arjuna asked Shri Krishna whether to fight or not, Shri Krishna could have given the answer right away. But he decided to deliver the discourse of the Gita instead, not just for Arjuna’s benefit but for the benefit of all future seekers. Having done so, he now vehemently points out the flaw in Arjuna’s decision. He says, in crystal clear language, that the decision to not fight is wrong. It is purely ego-driven, and not in line with Arjuna’s duty as a warrior.
 
In our personal experience, we come across stories of children who were misfits in their families and communities simply because their prakriti, their nature, their samskaaraas, were completely different. A family of doctors cannot get along with their son because he wants to become a musician. A family of traders is upset because their daughter wants to join the government civil service. Such conflict is a cause of endless frustration for families across the board, and there is no easy solution, because it is hard to change one’s mental makeup.
 
Why do parents want to foist its career path onto their children? It is purely due to ego. Parents have a strong sense of mine-ness with regards to their children. They prefer not to think of their children as independent entities. The egos of parents derive strength from this sense of mine-ness, and insist that they have the power to reshape the destiny of their children. Similarly, Arjuna also assumed that he could override his nature as a warrior, and become a monk. Shri Krishna reminded him that his inherent nature as a warrior would compel him to fight, and that he should reconsider his decision.