Srimad Bhagavatam Canto 03, Chapter 14, Text 16

SB 3.14.16

iti tam vira maricah
 krpanam bahu-bhasinim
pratyahanunayan vaca
 pravrddhananga-kasmalam
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
O hero [Vidura], Diti, being thus afflicted by the contamination of lust, and therefore poor and talkative, was pacified by the son of Marici in suitable words.
 
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
When a man or woman is afflicted by the lust of sex desire, it is to be understood as sinful contamination. Kasyapa was engaged in his spiritual activities, but he did not have sufficient strength to refuse his wife, who was thus afflicted. He could have refused her with strong words expressing impossibility, but he was not as spiritually strong as Vidura. Vidura is addressed here as a hero because no one is stronger in self-control than a devotee of the Lord. It appears that Kasyapa was already inclined to have sexual enjoyment with his wife, and because he was not a strong man he tried to dissuade her only with pacifying words.
Srimad Bhagavatam Canto 03, Chapter 14, Text 15
Srimad Bhagavatam Canto 03, Chapter 14, Text 17