The mouse has gone away from this world,
But he will come soon in some other form
To live his life,
I'll not be able to see the little one,
...
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Little mouse has still broader dream. Mouse also takes birth and dies. But soul leaves the body and does not die. Soul incarnates. Soul driving the mouse body will definitely incarnate. We are Bharatiya People and being Adi-Sanatani people, we believe in re-birth. Every soul wearing the dress (body) plays his part in this world drama wheel. And little mouse also plays. Here we are united and here we are separated. Separation gives us pain.
Definitely God will bless this soul wearing mouse body who has left this mortal world. I am surprised to find your quality and belief that you believe in re-birth. This concept is very natural and like other natural laws this properly works.