SB 11.20.16
aho-ratrais chidyamanam
buddhvayur bhaya-vepathuh
mukta-sangah param buddhva
niriha upasamyati
Translation:
Knowing that one’s duration of life is being similarly cut down by the passing of days and nights, one should be shaken by fear. In this way, giving up all material attachment and desire, one understands the Supreme Lord and achieves perfect peace.
Purport:
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 Krsna’s own spiritual nature, the devotee at last obtains perfect peace.