Vaishnava Samhita. Ganga Yamuna Charitam. Vol II Book VI Chp 4 Shlokas 31 - 32

हृदयेन विशुद्धेन प्रेमभावेन कन्यके 
आनन्दयामासतुस्तं दर्शनादेव सद्गुरुम् || 
गङ्गायमुनायोरेतेतत्पवित्रं चरितं पठन् 
कृष्णभक्तिमवप्नोति दुराचारोपि मानवः  ||
 

They also provided great happiness to their Sadguru through their piety of heart, pure loving devotion and their very presence. One who reads the story of Ganga and Yamuna will acquire Krishna Bhakti even if he happens to be a man of worst conduct.

Thus ends Chapter Four entitled 'Ganga Yamuna Charitam' of Book VI of Shri Vaishnava Samhita composed by Shri Shri Krishna Premi Swamigal