Mahabharata — Ashvamedhika Parva, Shloka 456
Mind as Charioteer; Kṣetrajña, Tapas, and Dhyāna-Yoga
Adhyātma-Upadeśa
ज्योतिषश्च गुणो रूप॑ं रूपं च बहुधा स्मृतम् शब्द, स्पर्श और रूप--ये तेजके तीन गुण कहे गये हैं। इनमें रूप ही तेजका मुख्य गुण है। रूपके भी कई भेद माने गये हैं
jyotiṣaś ca guṇo rūpaṃ rūpaṃ ca bahudhā smṛtam | śabdaḥ sparśaś ca rūpaṃ ca—tejasas trayo guṇāḥ smṛtāḥ | teṣu rūpam eva tejasas pradhāna-guṇaḥ | rūpasyāpi bahavo bhedāḥ manyante |
风神（Vāyu）开示：就火大（tejas）而言，其可识之德相为声、触与色相（形色）。其中，色相被视为火之主要标志，而色相本身亦有多种差别。此教法将知觉视为一门有纪律的探求：明了万物之定相，便能分辨真实与迷乱，以澄明而非冲动行事。
वायुदेव उवाच
Educational Q&A
That the element fire (tejas) is known through specific perceptible qualities—sound, touch, and especially form—and that careful discrimination of such qualities supports clear understanding and right action.
Vāyu-deva is instructing (in a philosophical register) about the properties of the elements, emphasizing that form is the chief distinguishing mark of fire and that form itself has many subtypes.