Greatness ~ we blow our own trumpet
If we consider ourselves great, we put up a wall to that greatness where we have to arrive. We create a bondage, so to say, that becomes an obstruction on the path. What's the harm? When we assume greatness, we start considering others as low (insignificant). Now that path which we have to trudge also gets closed, and we are wholly lost, to all intents and purposes. We blow our own trumpet in our own thoughts, and lose a lot in the process.
Taken from the book "Complete Works of Ram Chandra, Vol. 3 (1st Indian edn., 1999)", Chapter "Message on the Eve of His 83rd Birthday Celebrations", pg. 433, by Babuji Maharaj