Shloka 19
Adhyāya 214: Tapas Redefined—Perpetual Discipline, Hospitality, and the Ethics of Eating (तपः-निरूपणम्, विघसाशी-अतिथिप्रिय-धर्मः)
मध्ये च हृदयस्यैका शिरा तत्र मनोवहा । शुक्रे संकल्पजं नृणां सर्वगात्रै्विमुड्चति
madhye ca hṛdayasyaikā śirā tatra manovahā | śukre saṅkalpajaṃ nṛṇāṃ sarvagātrair vimucyati ||
ビーシュマは言った。「心臓のまさに中央には、『マノーヴァハー』（Manovahā）と呼ばれる一本の脈道（nāḍī）があり、心（意）を運ぶ者である。男が欲望から生じた決意（サンカルパ）を起こすと、それは精に働きかけ、全身の諸肢から引き寄せて放出させる。」
भीष्म उवाच
Educational Q&A
The verse links mental intention (saṅkalpa), especially desire-oriented resolve, with bodily processes, implying an ethical lesson: mastery of the mind is crucial for mastery of the senses and for brahmacarya/self-restraint.
In Bhīṣma’s instruction in the Śānti Parva, he explains a traditional mind–body mechanism: a ‘manovahā’ channel in the heart is said to transmit mental resolve and thereby affect the movement and discharge of semen throughout the body.