When one is firmly established in continence, vigor is gained
Patanjali makes a specific causal claim here — that consistent celibacy produces a tangible increase in vitality, not merely moral purity — which later commentators read as a statement about physical and mental capacity.
Sutra 2.38, brahmacaryapratishthayam viryalabhah, is commonly translated as "when one is firmly established in continence, vigor (virya) is gained." Virya carries a double sense in Sanskrit — it means both seminal fluid and heroic strength or potency — and that ambiguity is deliberate in the yogic tradition, which reads the sutra as describing a transformation of sexual energy into a broader vital and mental capacity. The word "firmly established" (pratishtha) matters: Patanjali is not describing occasional abstinence but a stable condition sustained long enough to produce a measurable effect. This sutra sits in a sequence where each mastered yama yields a specific result — nonviolence ends hostility in one's presence, truthfulness makes words infallible — so vigor from continence is presented as brahmacharya's parallel fruit, not a separate bonus.
Yoga Sutras
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- What celibate traditions say about energy
The claim itself is a single short line. Everything else in this tradition is commentary on it, which is worth knowing before anyone cites it as settled doctrine.