Prashna Upanishad 3.9
intermediate
तेजो ह वाव उदानस्तस्माद्उपशान्ततेजाः। पुनर्भवमिन्द्रियैर्मनसि सम्पद्यमानैः॥
tejo ha vāva udānastamādupaśāntatejāḥ | punarbhavamindriyairmanasi sampadyamānaiḥ ||
""Fire indeed is Udana. Therefore, when one's fire (heat) is extinguished, one is reborn, with the senses absorbed in the mind.""
What This Means:
Udana is connected to the body's fire/heat. When body heat fades (at death), the soul departs for rebirth, with senses withdrawing into mind.
Going Deeper:
The process of death: body heat leaves, senses merge into mind, and Udana carries the subtle body to the next life.
How To Apply This:
Observe how fever, cold, and body heat relate to vitality. Udana maintains the inner fire.
#fire#Udana#death#rebirth