Verse 218

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गुरुमंत्रोमुखेयस्य ।तस्यसिद्ध्यंतिनान्यथा ॥दीक्षयासर्वकर्माणि ।सिद्ध्यंतिगुरुपुत्रके ॥

In plain words

He in whose mouth the guru's mantra stands, for him they come out right, and not otherwise. By dīkṣā all works come out right in the guru's son.