Yoga Sutra 2.38 with establishment in brahmacarya, attainment of energy
Sūtra II.38
With establishment in brahmacarya, attainment of energy
From that attainment, he draws out invincible good qualities from himself And when perfected in it, he becomes able to confer knowledge on pupils.
With establishment in brahmacarya, attainment of energy. From that attainment of brahmacarya, he draws out invincible good qualities, he brings them out without limit from himself. He has irresistible energy for all good undertakings. The sense is, that he cannot be thwarted by any obstacle.
He becomes able to confer knowledge on pupils; to proper and virtuous pupils he can pass on his knowledge, as holy Vyāsa has enjoined.