Ramayana
अध्रुवे हि शरीरे यो न करोति तपोर्जनम् । स पश्चात्तप्यते मूढो मृतो दृष्ट्वा ऽ ऽत्मनो गतिम् ॥ 7-15-22 ॥
He who, in this impermanent body, does not amass the wealth of austerity, that fool repents afterward, when, having died, he beholds his own destiny.
english translation