In plain words
In the world it is harder still to find good gurus than to find good disciples. Only then can disciples become ideal lives. When students pure in heart, unselfish and free of Ahaṅkāra are found, the best gurus rejoice; just as the sage Śuka appeared as soon as King Parīkṣit became fit, when guru and disciple are of the best, the country is well and prosperous.