An intelligent devotee knows that the passing days and nights are exhausting one’s duration of life, and he therefore gives up his futile attachment to material sense objects. Instead, he strives to achieve permanent benefit in life. Just as the detached bird immediately gives up its nest and goes to another tree, similarly, a devotee knows that there is no permanent opportunity for residence within the material world. Instead he dedicates his working energy to achieving eternal residence in the kingdom of God. Transcending the modes of material nature by attaining Kṛṣṇa’s own spiritual nature, the devotee at last obtains perfect peace.