Shiva Purana

siva.sh/siva-purana/kotirudra-samhita/28/6

चकारैवं बहुतपो न प्रसन्नस्तदापि हि ।। परमात्मा महेशानो दुराराध्यो दुरात्मभिः ।। ६ ।।

sanskrit

Thus he performed penance a great deal. Even then Śiva the supreme soul, difficult to be propitiated by the wicked was not delighted.

english translation

cakAraivaM bahutapo na prasannastadApi hi || paramAtmA mahezAno durArAdhyo durAtmabhiH || 6 ||

hk transliteration by Sanscript