Intellect and Firmness are threefold according to gunas.
बुद्धेर्भेदं धृतेश्चैव गुणतस्त्रिविधं शृणु ।
प्रोच्यमानमशेषेण पृथक्त्वेन धनञ्जय ॥ २९ ॥
buddherbhedaṃ dhṛteścaiva guṇatastrividhaṃ śṛṇu .
procyamānamaśeṣeṇa pṛthaktvena dhanañjaya .. 29 ..
The threefold division of intellect and firmness according to qualities, about to be taught fully and distinctively (by Me), hear thou, O Dhanañjaya.
Read the commentary
Qualities : Guṇas, such as Sattva. The first half of the verse contains in an aphoristic form what is going to be taught. Dhanañjaya : the conqueror of wealth. Arjuna is so called because he acquired much wealth,—human and divine, material and spiritual,—during his tour of conquest through the four quarters of the earth.