रामायण - उत्तरकाण्ड - तपः

अध्रुवे हि शरीरे यो न करोति तपोऽर्जनम् ।
स पश्चात्ताप्यते मूढो मृतो दृष्ट्वात्मनो गतिम् ॥

- रामायण, उत्तरकाण्ड

adhruve hi sharIre yo na karoti tapOrjanam ।
sa pashcAttApyate mUDho mRuto dRuShTvA Atmano gatim ॥

- rAmayana, araNyakANDa

This is a destructible body that we live in. So, we must do our best to attain good karma by doing a lot of penance. If not, you will look upon yourself as a fool in your afterlife.

- Ramayana, Aranya