vṛttiḥ --- yaḥ kila brahmacaryamabhyasyati tasya tatprakarṣānniratiśayaṃ vīryaṃ sāmarthyamāvirbhavati| vīryanirodhe hi brahmacaryasya prakarṣāccharīrendriyamanaḥsu vīryaṃ prakarṣamāgacchati ||38||