And he saw in Krishna's mouth the entire Universe

This is a line out of "Life of Pi".

When I was young this statement might have been fanciful but I wouldn't have understood it's deeper meaning. Since then, I have experienced the whole universe inside myself and sometimes I can maintain this experience ongoing. So, looking into Krishna's or Shiva's or Jesus' or Buddha's mouth and seeing the whole universe isn't fanciful to me now but a genuine experience as real as the sun coming up in the morning and setting at night.

In western culture often we are taught that we are insignificant in order for people to control and dominate us so we feel bad about ourselves and become docile and easily controllable.

But, actually, like gods we are completely free of all constraints (as long as we recognize that all life in the universe is us and that we are all life in the universe). In this, we learn compassion and learn to treat all life like it was our mother or father or a friend.

This is what, "And he saw in Krishna's mouth the entire Universe" actually means. It means that you are not only seeing your innermost self in another's mouth or physical being, you are also coming to full realization through witnessing the entire universe in that moment. And from that moment of realization you can become fully realized and enlightened never to see yourself as separate from the universe in any way ever again.

And at that point, 'Seeing the Universe in Krishna's mouth" has very deep meaning in both your life and the lives of all beings inside and outside of time and space from that moment on.