We have needs other than simply maintaining our physical existence. Human existence is meant to facilitate our understanding of the purpose of life. Govinda dasa writes that just as a drop of water appears on a lotus leaf and can roll off at any moment, so life in the body is temporary. But let me worship Sri Hari. This is the only true necessity of life.
Lectures from a Disciple, Vol.2, Purpose of Sadhana Bhakti