Kadamba Kanana Swami:
One pastime that I like very much is when Krsna eats dirt. I like it so much because of course Mother Yashoda looks in His mouth and sees the entire universe there and that is quite amazing - that the universe is within Krsna who at the same time is within the universe - that is something really extraordinary!
He is within the universe very much, with us, and yet at the same time the universe is within Him, so how is this possible? By the laws of nature, it is not! By logic, it's not, but it's happening, and He shows it to Mother Yashoda right there and then!
She sees it is the real universe because when she looks in His mouth and she sees Krsna in that universe, she sees herself looking into the mouth of Krsna, and in that universe, again Krsna and again herself, again Krsna and again herself in so many universes and in that way: Mother Yashoda is totally amazed!
And here we see the nature of the Supreme Lord and it is very nice because here we can develop faith that everything is Krsna! Otherwise we may doubt - how can this cowherd boy who is playing with His calves and the cowherd boys in the forest - how can He at the same time be the origin of everything? How can He be everything? Krsna is simultaneously everything and simultaneously a cowherd boy? How is this possible? Shouldn't Krsna just be the cowherd boy PLUS everything, and wouldn't that be complete? Mathematically, you would think like that. You would think that God means the personal cowherd boy plus everything else - that must be Him. No, Krsna is already complete. He is complete, and yet the universe exists without Him as if it's separate from Him ....It's bewildering, but quite amazing. So this pastime is very important because this pastime is really giving us an insight how Krsna is everything, and at the same time, how He is separate from everything!"
(Kadamba Kanana Swami 2006)