Premanand Maharaj Ji
Why is it so hard to destroy ego, and what makes it possible?
Ego needs sadhana and the Guru's grace
Ego is very hard to end because we cannot bear even a small hurt to it. It does not go without sadhana, which needs the Guru's grace, which in turn needs Bhagwan's grace.
But ego is not destroyed without sadhana, and sadhana that destroys ego does not happen without the Guru's grace.