Śivasaṃhitā 5.72

The circulation of vāyu through all the nāḍī—including the most peripheral channels—produces an effect on the bodily fluids (dhātu rasa) that the text describes as acquisition of extraordinary force and energy. This is the physical correlate of spiritual practice: when prāṇa flows freely through all subtle channels, ordinary physiology is enhanced. Experienced practitioners report exactly this: greater physical vitality during and after intense prāṇāyāma practice.

Svayambhūliṅga—“the self-born liṅga”—is the symbol of Śiva in mūlādhāra: the presence of the conscious principle at the densest point of vital energy. Unlike the liṅga installed in temples by priests’ hands, this liṅga is svayambhū—self-generated, without human author. Meditation on it is therefore contact with the most intimate and immanent divine dimension of being.

The warning against pramāda (negligence, carelessness) emphasizes that mūlādhāra practice requires daily consistency. Occasional meditation produces occasional results; daily practice (prati-aham) creates the sustained abhyāsa field that transforms the structure of being. The promise that “all powers” (sarvaśakti) flow from this practice connects to verse 64: the yogin who equals Śiva does so not through sudden grace but through accumulated practice.