SB 6.18.56

mātṛ-ṣvasur abhiprāyam
 indra ājñāya mānada
śuśrūṣaṇenāśrama-sthāṁ
 ditiṁ paryacarat kaviḥ
Synonyms: 
mātṛ-svasuḥ — of his mother’s sister; abhiprāyam — the intention; indraḥ — Indra; ājñāya — understanding; māna-da — O King Parīkṣit, who give respect to everyone; śuśrūṣaṇena — with service; āśrama-sthām — residing in an āśrama; ditim — Diti; paryacarat — attended upon; kaviḥ — seeing his own interest.
Translation: 
O King, who are respectful to everyone, Indra understood Diti’s purpose, and thus he contrived to fulfill his own interests. Following the logic that self-preservation is the first law of nature, he wanted to break Diti’s promise. Thus he engaged himself in the service of Diti, his aunt, who was residing in an āśrama.