p. 275
या विद्या ब्रह्मचर्येण वेदितुं शक्या, तत् साधनभूतं ब्रह्मचर्यं कथं स्यात् ।एतत् ब्रह्मचर्यं विद्वन्, ब्रवीहि मे ॥
In plain words
There is a knowledge that can be reached only through brahmacarya. So what is brahmacarya, the very means of reaching it? Tell me this, you who know.
Close to the Sanskrit
That knowledge which is able to be known through brahmacarya — that brahmacarya, which stands as its means, how might it be? This brahmacarya, O knower, tell me.