Mahabharata — Ashvamedhika Parva, Shloka 10
Mind as Charioteer; Kṣetrajña, Tapas, and Dhyāna-Yoga
Adhyātma-Upadeśa
नित्यं द्वन्द्धसमायुक्तं सत्त्वमाहुर्मनीषिण: । निर्दचन्दो निष्कलो नित्य: क्षेत्रज्ञो निर्गुणात्मक:,मनीषी पुरुष सत्त्वको द्वन्धयुक्त कहते हैं और क्षेत्रज्ञ निर्दन्द्ध, निष्कल, नित्य और निर्मुणस्वरूप है
nityaṁ dvandva-samāyuktaṁ sattvam āhur manīṣiṇaḥ | nirdvandvo niṣkalo nityaḥ kṣetrajño nirguṇātmakaḥ ||
风神说道：“智者宣说：有身之萨特瓦（其生存倾向）恒与诸对待相缠——乐与苦、得与失、誉与毁。然而知田者（kṣetrajña，内在见证者）超越此等二相：无分无片，常住不变，其性越于诸古那（guṇa）。故而，道德之坚定在于：洞见心中对待之戏不断变幻，而安住于不二、无所染著的自性。”
वायुदेव उवाच
Educational Q&A
The verse distinguishes between the mind/embodied disposition that is continually caught in dualities (dvandvas) and the kṣetrajña—the inner witness—which is untouched by them, partless, eternal, and beyond the guṇas. Ethical steadiness comes from identifying with the witness rather than the fluctuating opposites.
Vāyu-deva is instructing the listener in a philosophical-ethical reflection: ordinary experience is marked by constant oscillation between opposites, but the true Self (kṣetrajña) remains unaffected. The teaching guides the hearer toward detachment and discernment.