Shiva Purana
सात्त्विकं राजसं चैव तामसं त्रिविधं स्मृतम् ॥ विज्ञेयं हि तपो व्यास सर्वसाधनसाधनम्॥ ९ ॥
O Vyāsa, penance is the means for achieving everything. It is of three kinds viz. Sāttvika, Rājasa and Tāmasa.
english translation
sAttvikaM rAjasaM caiva tAmasaM trividhaM smRtam ॥ vijJeyaM hi tapo vyAsa sarvasAdhanasAdhanam॥ 9 ॥
hk transliteration by Sanscript