The physical body acts as a barrier to change. It does not completely allow change to happen completely. The changes keep accumulating “ahead of us” and give us a future (as they are prevented from moving into the past by the physical body) – the changes that have remained incomplete form our mind and project our future. With time, these accumulated incomplete events accumulate energy and change us to relieve the energy. Because of this accumulated energy these incomplete events have essence or nature.
But when the pass throught the void, they lose their essence or swabhava.
These incomplete events form our mind – our impending future that lay ahead of us giving us a sense of who we are – a self.