Ego
The word 'ego' is said to have been abused by all the present and past writers. The ego gives you strength for all the work. It points out to you that you have got the power to do a certain thing. But we identify ego with the body, instead of with the soul. It is the production of God, which you cannot annihilate. You should modify it. Suppose a man has got an immense fortune and he is proud of that. He commits no sin, because it does not do harm to anybody. What happens as a result of it is that the wisdom of the man becomes blunt.
Taken from the book "Complete Works of Ram Chandra, Vol. 3", Chapter "1929", pg. 35, by Babuji Maharaj