SB 3.5.17
sri-suka uvaca
sa evam bhagavan prstah
ksattra kausaravo munih
pumsam nihsreyasarthena
tam aha bahu-manayan
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Sukadeva Gosvami said: The great sage Maitreya Muni, after honoring Vidura very greatly, began to speak, at Vidura’s request, for the greatest welfare of all people.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
The great sage Maitreya Muni is described here as bhagavan because he surpassed all ordinary human beings in learning and experience. Thus his selection of the greatest welfare service for the world is considered authoritative. The all-inclusive welfare service for the entire human society is devotional service to the Lord, and, as requested by Vidura, the sage described the same very appropriately.