Bhagavad Gita 18.29

बुद्धेर्भेदं धृतेश्चैव गुणतस्त्रिविधं श्रृणु।प्रोच्यमानमशेषेण पृथक्त्वेन धनञ्जय॥

buddherbhedaṃ dhṛteścaiva guṇatastrividhaṃ śrṛṇu |procyamānamaśeṣeṇa pṛthaktvena dhanañjaya ||

Hear thou the threefold division of intellect and firmness, according to the Gunas, as I declare them fully and distinctly, O Arjuna.

Reason and conviction are threefold, according to the quality that is dominant. I will explain them fully and separately, O Arjuna!

Our plain-language meaning of this verse is waiting for scholar review.