Bhagavad Gita · 18.29

बुद्धेर्भेदं धृतेश्चैव गुणतस्त्रिविधं शृणु।प्रोच्यमानमशेषेण पृथक्त्वेन धनञ्जय॥

buddher bhedaṁ dhṛiteśh chaiva guṇatas tri-vidhaṁ śhṛiṇu prochyamānam aśheṣheṇa pṛithaktvena dhanañjaya

Hear now, O Dhananjaya, the threefold division of intellect and determination according to the gunas, explained fully and separately.

— Bhagavad Gita 18.29

Source: Sacred-Texts.com (Sanskrit) + Bhagavad-Gita.io (translations)