"I am nothing, What he said was true, There is no need to have this knowledge and power of mine if I can't even use it to feed my family's stomachs."
Drona was returning back to the Hastinapur but his head for the first time was not proud upright but hung low as he felt guilt and shame.
The words spoken by Durpada stabbed in his heart not only because they were hurtful but because they were true.
Indeed what's the use of having the might to beat gods when you can't even fulfil the simple wish of your son? Can't even afford one single cow? That he has to go and beg for his old friend for it?
He finally understood that having pride and self-respect is good but it was not bigger than the happiness of his family, He can't let them suffer because of him, He couldn't allow his innocent lovely Ashwatthama to be bullied because of being poor.