Self (Atman) is our pure, natural and true state. To be conscious of our Self is to remain what we really are. But, we confuse ourselves by believing "I am the body", "I am so-and-so" etc. We identify our consciousness "I am" with a particular body. Our consciousness is not something material whereas our body is merely a bundle of physical matter. Yet, we are deluded into mistaking this material body to be our consciousness. By spiritual progress, I only meant to correct this mistake. So, it cannot be a desire. It is only correcting the mistake. It is only seeking and realising the Atman within; to be what really, originally and naturally we are.
Lord Rama has come back to throne, not out of desire, but to perform his duties as King. Everyone has to perform his duties. He should perform them not with an eye on the reward, not with a sense of "I" but with a sense of duty. Renunciation does not mean leaving everything and going to the forest. Renunciation means remaining in the world, performing the duties and yet adopting a sense of detachment.
V.S. Krishnan