Methinks thou couldst not hope to find One spark of virtue in my mind, If thou, whose wish is still my lord, Hast for this grace the king implored. This day I go, but, ere we part, Must cheer my Sítá’s tender heart, To my dear mother bid farewell; Then to the woods, a while to dwell.

In plain words: Rama tells Kaikeyi she must think he has no goodness, since she asked the king for this instead of simply asking Rama himself. He will leave today, but first he will comfort his wife Sita and say goodbye to his mother.