p. 281
तथा बलं च तद्धर्मपरिपालनसामर्थ्यं च सर्वम् आचार्ययोगे एव फलति, नाचार्ययोगं विना फलति ।श्रूयते च—‘आचार्याद्धैव विद्या विदिता’ इति, ‘आचार्यवान्पुरुषो वेद’ इति च ।ब्रह्मार्थयोगेन च ब्रह्मचर्यं यदिदं गुरुसंनिधौ शुश्रूषाद्याचरणम्, तद्ब्रह्मचर्यं ब्रह्मार्थयोगेन फलति स्वात्मनः चित्सदानन्दाद्वितीयब्रह्मैक्यसंपादनद्वारेण फलतीत्यर्थः ॥
In plain words
In the same way, inner fortitude and the capacity to uphold righteousness only reach fruition when anchored in a teacher; without a teacher, they bear no fruit at all. Scripture itself declares: 'Knowledge gained directly from the teacher alone leads to liberation,' and 'Only the person who has a master truly knows.' When this disciplined life of studenthood—consisting of attentive service near the preceptor—is directed toward the absolute, it yields its ultimate reward by revealing your identity with the secondless Brahman, which is pure existence, consciousness, and bliss.
Close to the Sanskrit
Thus, strength and the capacity to safeguard righteousness all bear fruit solely through connection with the teacher, and do not bear fruit without connection to the teacher. It is also heard in scripture: 'Knowledge known precisely from the teacher alone,' and 'A person who has a teacher knows.' And through connection with the purpose of Brahman, this brahmacarya—which is the practice of service and the like in the presence of the guru—bears fruit through connection with the purpose of Brahman, bearing fruit through the means of accomplishing identity with the secondless Brahman of the nature of consciousness, existence, and bliss of one's own Self; this is the meaning.