When Diti, Indra's aunt, explained to Indra without reservations what she had wanted to do, Indra explained his intentions to her. Thus both of them, instead of being enemies, freely spoke the truth. This is the qualification that results from contact with Viṣṇu. As stated in Śrīmad-Bhāgavatam (SB 5.18.12):
- yasyāsti bhaktir bhagavaty akiñcanā
- sarvair guṇais tatra samāsate surāḥ
If one develops a devotional attitude and becomes purified by worshiping the Supreme Lord, all the good qualities are certainly manifested in his body. Because of being touched by worship of Viṣṇu, both Diti and Indra were purified.