Shiva Purana
इन्द्रस्तु सुखदाता वै मुक्तिदाता भवेन्न हि ॥ तस्मात्त्वं सर्वथा श्रेष्ठ कर्तुमर्हसि सत्तपः॥ ४५॥
Indra is the bestower of happiness and not of salvation. O excellent one, it behoves you therefore to perform a more excellent penance.
english translation
indrastu sukhadAtA vai muktidAtA bhavenna hi ॥ tasmAttvaM sarvathA zreSTha kartumarhasi sattapaH॥ 45॥
hk transliteration by Sanscript