Vaishnava Samhita. Gopinatha Charitam. Vol II Book VI Chp 6 Shloka 9

दर्शनस्पर्शसल्लापसंस्कारैर्गुरुपुङ्गवाः   |
कृष्णभक्तिं प्रयच्छन्ति परिपूर्णाः स्वयं तथा  ||

The preachers and acharyas first perfect themselves. Then they impart Krishna bhakti through their darshan, touch, sweet conversation, and rituals.