It was ordained that Rāvaṇa, chief of the Rākṣasas, could not be killed by anyone but a man, and for this reason Lord Rāmacandra, the Supreme Personality of Godhead, appeared in the form of a human being. Lord Rāmacandra’s mission, however, was not only to kill Rāvaṇa but also to teach mortal beings that material happiness centered around sex life or centered around one’s wife is the cause of many miseries. He is the self-sufficient Supreme Personality of Godhead, and nothing is lamentable for Him. Therefore why else could He be subjected to tribulations by the kidnapping of mother Sītā?