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When Raavan went to abduct Seetaa, he said to Her - "Although Raam was the eldest son of Dashrath and was supposed to be the king but Raajaa established his younger son Bharat as a king and Raam was sent to forest. Now see, what is he and who am I?"

Some commentators reason this as: ’you are the Goddess Lakshmee, an inner-ruler in all beings... (1) though Dashrath was uninterested to select Bharat you made Dashrath, as his inner force, to select a spineless Bharat, and Bharat was established on the throne by Dashrath, through you...(2)  besides, though Dashrath was disinterested to send his dear eldest son Raam to forests, you as Dashrath’s inner force made him to send Raam to forests - his the eldest, the best, and the only ruler of people, namely Raam, [as said in Vishnu’s Thousand names] to forests for the elimination of Raakshas, and thereby releasing us from our accursed being... Hence you, as inner force of everybody, had to come to me also, if Raam’s incarnation is to yield its results."

 Means if Raam's incarnation was to be successful then You (Lakshme) has to come with me to Lankaa.