The purport of this statement by Indra is that beginning from Brahmā down to the insignificant ant, no living entities are meant for enjoying the material opulences. They are simply meant for offering everything to the supreme proprietor, the Personality of Godhead. By doing so, they automatically enjoy the benefit. The example can be cited again of the different parts of the body collecting foodstuffs and cooking them so that ultimately a meal may be offered to the stomach. After it has gone to the stomach, all the parts of the body equally enjoy the benefit of the meal. So, similarly, everyone's duty is to satisfy the Supreme Lord, and then automatically everyone will become satisfied.
A similar verse is found in the Eighth Canto, Third Chapter, of Śrīmad-Bhāgavatam, verse 20. Gajendra says there, "My dear Lord, I have no experience of the transcendental bliss derived from Your devotional service, so therefore I have asked from You some favor. But I know that persons who are pure devotees and have, by serving the lotus feet of great souls, become freed from all material desires, are always merged in the ocean of transcendental bliss and, as such, are always satisfied simply by glorifying Your auspicious characteristics. For them there is nothing else to aspire to or pray for."