When Kṛṣṇa was present five thousand years before, not that everyone could see Him, because they had no such eye. Suppose if President Johnson comes before us immediately, but if you have no acquaintance, if you have no information of the feature of President Johnson or something, even if he is present we cannot see. We'll think, "Oh, he may be an ordinary gentleman. As others come, he has also come."
Similarly, unless we know about Kṛṣṇa by the symptoms . . . there are two mistakes: to understand God as common man or to accept a common man as God. Both things are mistakes. So one has to understand. That understanding is there in the Bhagavad-gītā. God Himself, Kṛṣṇa Himself, is describing about Himself, so there is no difficulty. But unfortunately, we have developed such material consciousness that even God describes Himself, even we see God face to face, because we have no Kṛṣṇa consciousness, therefore we cannot see. Therefore we cannot see. So avajānanti māṁ mūḍhā. Those who cannot see, they are described here as mūḍhā. Mūḍhā means foolish or less intelligent class men.
So avajānanti māṁ mūḍhā mānuṣīṁ tanum āśritam (BG 9.11). In the Bhagavad-gītā, Lord Kṛṣṇa says, "Because I am here amongst the human being as a man, therefore those who are less intelligent, they are deriding at Me." Avajānanti māṁ mūḍhā mānuṣīṁ tanum āśritam paraṁ bhāvam ajānanta. "Why they deride? Because they do not know what is My background." Paraṁ bhāvam. Paraṁ bhāvam ajānanta, sarva-bhūta-maheśvaram. "They do not know that I am the Supreme Lord, and situated in everyone's heart. Because they do not know, therefore they deride at Me."