The foodstuff is offered there to Kṛṣṇa. He is eating by seeing. He can eat through His eyes. Just like we can eat through our mouth, not with our eyes, but Kṛṣṇa can eat through His eyes simply by seeing. Then you may argue that, "The foodstuff is offered. If He has eaten, why it is lying as it is, as it was offered in the beginning?" That is answered in the Upaniṣad: pūrṇasya pūrṇam ādāya pūrṇam evāvaśiṣyate (Īśo Invocation). Pūrṇasya. Kṛṣṇa can take the whole plate, but still the whole plate remains. It is not finished. That is spirituality. Pūrṇasya pūrṇam ādāya pūrṇam evāvaśiṣyate.
So this is a great science, spiritual science. Unfortunately, we have no educational system to understand this spiritual science. And especially in this age, everything is godlessness. Therefore people are not happy. Our this Kṛṣṇa consciousness movement is only to make people happy by becoming Kṛṣṇa conscious, understanding everything in the right ways. That is our mission. Therefore . . . that is the mission of every devotee. Just like Arjuna is asking herewith. He knows everything. He is Kṛṣṇa's friend, personal friend. He is always living with Kṛṣṇa. There cannot be any ignorance on the part of Arjuna. But he's asking this question just for our benefit. Kṛṣṇa will answer this question.
Why Kṛṣṇa's answers will be taken so seriously? Because He is the supreme authority, Supreme Personality of Godhead. If we receive knowledge from the Supreme, then it is perfect knowledge. Just like if you get some knowledge from the superior, one who is more educated than you, one who is more experienced, that knowledge is perfect. So in this material world there may be somebody supreme, but he is not ultimate supreme. But ultimate supreme is Kṛṣṇa. Īśvaraḥ paramaḥ kṛṣṇaḥ sac-cid-ānanda-vigraha, anādir ādir govindaḥ sarva-kāraṇa-kāraṇam (Bs. 5.1). So if we receive knowledge from the ultimate supreme, īśvaraḥ paramaḥ kṛṣṇaḥ, then our knowledge is perfect. If we receive knowledge secondary, secondhand knowledge, that is also good. Secondhand knowledge means one who has received knowledge from Kṛṣṇa. That knowledge is perfect.