Shiva Purana

siva.sh/siva-purana/kotirudra-samhita/25/16

ईदृशं च तपः कृत्वा साध्यते फलमुत्तमम् ।। शुभं फलं स्वयं हित्वा साध्यते नाहितं पुनः ।। १६ ।।

sanskrit

Excellent results are sought after performing, penance. No harm is sought after voluntarily eschewing auspicious results.

english translation

IdRzaM ca tapaH kRtvA sAdhyate phalamuttamam || zubhaM phalaM svayaM hitvA sAdhyate nAhitaM punaH || 16 ||

hk transliteration by Sanscript