Transmigration is a stage in between two stages. We were born millions of years ago as souls and have taken birth in physical bodies of millions of different species including human species. Every time we take birth in a physical body, it is to be understood as a transmigration stage, as after death we (the soul) would get into another physical body of any other species. This means there is no permanency in any body and we cannot be guaranteed a human body all the time. This also implies that we must have no ego whatsoever of being born as a human being. It is only that temporarily we are in this body and nobody knows what we would be in our next birth: a monkey, a donkey, a bird, a snake or a fish...
The false pride of being wealthy, healthy, intelligent, having a high status, position and knowledge is all temporary. Before we had acquired these things they belonged to somebody else and after us they will belong to others. We possess these things temporarily but develop a permanent ego. And the rule is temporary things will give temporary pleasure; permanent things will give permanent happiness. And now the search has to begin as to what is that which is permanent. Find out who you are? What is your true identity? From where have you come? Where will you go after death? What is the purpose of your coming into existence in this world? The answers to these questions will take you to that, which is permanent and eternal in this creation. Find out answers as quickly as possible, if you wish to live the life of a liberated soul (enlightened soul). The world is different when it is lived and experienced in an ignorant state and is different in an enlightened state.
