When actually one becomes intelligent, then the enquiry is, "Why? Why I am put into this miserable condition of life? I do not want this, and it is forced upon me. I do not want to die; death is there. I do not want disease; the disease is there. I do not want this, it is forced upon me. I don't want war, but they, the draft board drags me to the war. Why these are?" This "why" question must be there. That is intelligence. That is Kenopaniṣad, Kena.
There is Upaniṣad, Kena. And Sanātana Gosvāmī, when he approached Caitanya Mahāprabhu, he also inquired this "Why?" Ke āmi, kene āmāya jāre tāpa-traya (CC Madhya 20.102). "Who am I? Why I am put into this miserable condition of life?" That is intelligence. He was minister. He could understand that, "I am minister. People adore me as very learned man."
He said that to Caitanya Mahāprabhu. Grāmya-vyavahāre paṇḍita, satya kari māni: "My dear Lord, these common people, my neighbors, because I am minister and I'm supposed to be educated, I know little Sanskrit, I know little Arabian language, they call me paṇḍita, learned man, very scholar and versed. I, to tell You frankly, I do not know what I am. So what is the value of my education? I do not know." Ke āmi, kene āmāya jāre tāpa-traya. "What I am."
So this is called intelligence. And cats and dogs, they are suffering; they don't mind. "Oh, I . . ." They forget. You have got experience. A cat is coming to eat some milk here; you chastise, you . . . but again it comes, again it comes. Because it is animal.