bhuyad yena suto hi me
asasanasya—thinking; tasya—of him; idam—this (body); dhruvam—eternal; unnaddha-cetasah—whose mind is unrestrained; mada-sosakah—who can remove the madness; indrasya—of Indra; bhuyat—may there be; yena—by which; sutah—a son; hi—certainly; me—of me.
Diti thought: Indra considers his body eternal, and thus he has become unrestrained. I therefore wish to have a son who can remove Indra’s madness. Let me adopt some means to help me in this.
One who is in the bodily conception of life is compared in the sastras to animals like cows and asses. Diti wanted to punish Indra, who had become like a lower animal.
Link to this page: https://prabhupadabooks.com/sb/6/18/26