बुद्धेर्भेदं धृतेश्चैव गुणतस्त्रिविधं शृणु ।प्रोच्यमानमशेषेण पृथक्त्वेन धनञ्जय॥
buddher bhedaṃ dhṛteś caiva guṇatas tri-vidhaṃ śṛṇuprocyamānam aśeṣeṇa pṛthaktvena dhanañjaya
Word by word
The verse says
Hear now the threefold division of understanding and of steadiness, set out fully and separately, according to the strands.
In plain words
Two more things to be cut into three. Understanding, and steadiness.
These are the two faculties you would normally use to evaluate everything else, which is what makes this pair interesting.
He is about to tell you that your judgement and your persistence come in grades, and that you cannot check yours with the very thing being graded.
Where you've felt this · in study
Your uncle is certain he is a careful driver. He has had three minor accidents in two years, all of them other people's fault in his account. The thing that would have to notice the pattern is the same thing producing the account. Nothing inside the car can settle it.
Going deeper
Grading the instruments you judge with is the uncomfortable move in this pair, and it has a practical consequence.
Understanding is what you decide with. Steadiness is what you keep going with. If both come in three grades, then your assessment of your own understanding was made using your understanding, at whatever grade it happens to be.
That sounds like a trap with no way out, and in one sense it is. There is no view from outside your own judgement. But there is something almost as good, and the chapter is about to supply it: a description of each grade specific enough to be recognised from the behaviour it produces rather than from how it feels.
That is the usable move. You cannot audit your own judgement directly. You can look at the decisions it produced over five years, and that record is not written by the faculty being examined.