Amid all duties, Queen, I count This duty first and paramount, That sons, obedient, aye fulfil Their honoured fathers’ word and will. Without his word, if thou decree, Forth to the forest will I flee, And there shall fourteen years be spent Mid lonely wilds in banishment.

In plain words: Rama says that, of all duties, the most important is for a son to obey his father's word. Even without hearing it from the king himself, he will go to the forest for fourteen years if Kaikeyi says so.