Power of Bad Association: It was a known fact in Ayodhya that Kaikeyi loved Lord Rama more than his own son Bharath, then how could she become so evil. It is by her bad association with Mantara.
Attachment to service & not to the position: Lord Ram was willing to become the king as a service to Maharaj Dasarath and He was also willing to go to the forest as a service to His father.
Mission of Life should be to vanquish the demoniac tendencies in our heart: Lord Ram’s purpose to kill the demon