Arjuna in the Mahabharata underwent a role reversal. He spent years and years training and performing as one of the greatest archers / warriors that ever lived. But on the day of the Kurukshetra battle, he underwent an unexpected role change.
He saw no foes or enemies, only brothers and uncles and teacher.
He was suddenly not a warrior on that battlefield, but only a family man. Can a doctor perform a high risk surgery successfully on his own child? Very difficult. Why? Because he has entered he operating theatre less as a doctor and more as a father. Can we clinch a business deal if we are constantly thinking about being with family or vacationing?
The pangs of attachment begin to play on the mind, leading to what Arjuna faced as well – delusion.
What is the solution? Before solution, must come acknowledgement of the problem. One the problem is located, the resolver is the Guru. But the resolution happens, only if the ego is surrendered to him.
As Swami Paramarthananda says, the disciple needs to first identify that a problem exists. And then the Guru needs to not only know the remedy, but also be free of the problem!