In plain words
The yogin satisfied by jñāna and vijñāna, unshaken and with senses conquered, for whom earth, stone, and gold are alike, is said to be collected.
Word for word
Content in mind with jñāna and vijñāna, unshaken, with senses conquered, [he] is called 'collected'; the yogin [is one] to whom clod, stone and gold are alike.
ज्ञानविज्ञानतृप्तात्मा कूटस्थो विजितेन्द्रियःयुक्त इत्युच्यते योगी समलोष्टाश्मकाञ्चनः
Other commentaries
The commentators
▸Bhagavadgītābhāṣyam· bhāṣya
ज्ञानविज्ञानतृप्तात्मा ज्ञानं शास्त्रोक्तपदार्थानां परिज्ञानम् , विज्ञानं तु शास्त्रतो ज्ञातानां तथैव स्वानुभवकरणम् , ताभ्यां ज्ञानविज्ञानाभ्यां तृप्तः सञ्जातालंप्रत्ययः आत्मा अन्तःकरणं यस्य सः ज्ञानविज्ञानतृप्तात्मा, कूटस्थः अप्रकम्प्यः, भवति इत्यर्थः ; विजितेन्द्रियश्च । य ईदृशः, युक्तः समाहितः इति स उच्यते कथ्यते । स योगी समलोष्टाश्मकाञ्चनः लोष्टाश्मकाञ्चनानि समानि यस्य सः समलोष्टाश्मकाञ्चनः ॥ ८ ॥
In plain words
'Of mind satisfied with theoretical knowledge and experiential realization' — 'theoretical knowledge' means understanding the categories scripture teaches; 'experiential realization' means actually living out, in one's own experience, exactly what scripture describes. Someone satisfied by both together, in whom the sense 'this is enough' has fully arisen — that person's mind is 'satisfied with theoretical knowledge and experiential realization.' Such a person is 'unshakeable' — nothing can move him. That's the meaning; and 'of conquered senses' too. Whoever is like this is called 'integrated,' meaning composed. And this yogin 'sees a clod of earth, a stone, and gold as all the same' — someone for whom dirt, rock, and gold hold no more or less value than each other.
Close to the Sanskrit
'Of mind satisfied with theoretical knowledge and experiential realization': 'theoretical knowledge' means comprehension of the categories stated in scripture; 'experiential realization,' however, means directly effecting one's own experience, in that very way, of things known from scripture; satisfied by those two, theoretical knowledge and experiential realization, in whom the conviction 'this suffices' has arisen — [that is,] the mind, [i.e.] the inner faculty, of whom [is thus] — he is 'of mind satisfied with theoretical knowledge and experiential realization.' 'Unshakeable,' [i.e.] not to be shaken, he is. That is the meaning; and 'of conquered senses.' Whoever is such, 'integrated,' [i.e.] composed, is called, [i.e.] said [to be], 'he.' 'He, the yogin, is one for whom a clod of earth, a stone, and gold are equal': a clod of earth, a stone, and gold are equal for whom — he is 'one for whom a clod of earth, a stone, and gold are equal.'