Life becomes an aimless drift as it emerges out of matter where it has lost itself. It begins to emerge and start its evolutionary journey as a prisoner of matter and fully dependent upon it.
Sri Aurobindo is revealing to us a whole occult side of life, not just the layers and levels but also the beings and forces and energies at each level.
Such is the strong grip of this little life upon us that we remain strongly tied to it. Our being centered around our little desires and moved by these forces we miss the real purpose of life.