This truth (about Tirthas) should be recited to the ears of only Brahmanas, of the pious men, one's of own sons, friends, disciples and dependants.
इदं सत्यं द्विजातीनां साधूनामात्मजस्य च। सुहृदां च जपेत् कर्णे शिष्यस्यानुगतस्य च॥