SB 4.13.24
etad akhyahi me brahman
sunithatmaja-cestitam
sraddadhanaya bhaktaya
tvam paravara-vittamah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Vidura requested Maitreya: My dear brahmana, you are well conversant with all subjects, both past and future. Therefore I wish to hear from you all the activities of King Vena. I am your faithful devotee, so please explain this.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Vidura accepted Maitreya as his spiritual master. A disciple always inquires from the spiritual master, and the spiritual master answers the question, provided the disciple is very gentle and devoted. Srila Visvanatha Cakravarti Thakura said that by the mercy of the spiritual master one is blessed with the mercy of the Supreme Lord. The spiritual master is not inclined to disclose all the secrets of transcendental science unless the disciple is very submissive and devoted. As stated in the Bhagavad-gita, the process of receiving knowledge from the spiritual master entails submission, inquiry and service.