Srimad Bhagavatam Canto 08, Chapter 15, Text 28

SB 8.15.28

sri-gurur uvaca
janami maghavañ chatror
 unnater asya karanam
sisyayopabhrtam tejo
 bhrgubhir brahma-vadibhih
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Brhaspati, the spiritual master of the demigods, said: O Indra, I know the cause for your enemy’s becoming so powerful. The brahmana descendants of Bhrgu Muni, being pleased by Bali Maharaja, their disciple, endowed him with such extraordinary power.
 
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Brhaspati, the spiritual master of the demigods, informed Indra, “Ordinarily, Bali and his forces could not achieve such strength, but it appears that the brahmana descendants of Bhrgu Muni, being pleased with Bali Maharaja, endowed them with this spiritual power.” In other words, Brhaspati informed Indra that Bali Maharaja’s prowess was not his own but that of his exalted guru, Sukracarya. We sing in our daily prayers, yasya prasadad bhagavat-prasado yasyaprasadan na gatih kuto ’pi. By the pleasure of the spiritual master, one can get extraordinary power, especially in spiritual advancement. The blessings of the spiritual master are more powerful than one’s personal endeavor for such advancement. Narottama dasa Thakura therefore says:
 
guru-mukha-padma-vakya, cittete kariya aikya,
 ara na kariha mane asa
 
Especially for spiritual advancement, one should carry out the bona fide order of the spiritual master. By the parampara system, one can thus be endowed with the original spiritual power coming from the Supreme Personality of Godhead (evam parampara-praptam imam rajarsayo viduh).
Srimad Bhagavatam Canto 08, Chapter 15, Text 27
Srimad Bhagavatam Canto 08, Chapter 15, Text 29