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आचार्ययोगे फलतीति चाहुर्ब्रह्मार्थयोगेन च ब्रह्मचर्यम् ॥ १४ ॥
In plain words
It bears fruit when a teacher is joined to it — so they say; and brahmacarya is brahmacarya when it is joined to Brahman as its aim.
Close to the Sanskrit
In connection with a teacher it bears fruit — thus, they say; and brahmacarya (is such) through connection with Brahman as its aim.