Shiva Purana

siva.sh/siva-purana/kotirudra-samhita/32/13

सर्वं स्वार्थपरं देवि त्रिलोक्यां नात्र संशयः ।। जानीहि त्वं विशेषेण बुद्ध्या शोकं न वै कुरु ।। १३ ।।

sanskrit

Everything in the three worlds, O goddess, is undoubtedly selfish. Know that you should not grieve especially with your intelligence.

english translation

sarvaM svArthaparaM devi trilokyAM nAtra saMzayaH || jAnIhi tvaM vizeSeNa buddhyA zokaM na vai kuru || 13 ||

hk transliteration by Sanscript