Shiva Purana
चकारैवं बहुतपो न प्रसन्नस्तदापि हि ॥ परमात्मा महेशानो दुराराध्यो दुरात्मभिः ॥ ६ ॥
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