In the context of enlightenment, the most important task is maintaining a connection to the higher self. I recommend doing this at least once a day formally during a morning meditation, and informally as often as we remember during the day.
We, self-conscious souls, mediate between the higher self and our body/nature.
Human existence is intangible. Like ghosts, we show up, haunt the planet for a lifetime and disappear again. All we leave behind are fading memories in those who knew us.