गुरुवक्त्रेस्थिताविद्या ।गुरुभक्त्याचलभ्यते ॥त्रैलोक्येऽस्फुटवक्तारो ।देवाद्यसुरपन्नगाः ॥
In plain words
The vidyā that stands in the guru's mouth is gained by bhakti towards the guru. In the three worlds the gods and their kind, the asuras and the pannagas speak of it, but not plainly.