All things die and all things are born again. This is the nature of this self-transcending world.
The body is an instrument of the Soul which is part and parcel of a Higher Entity which some call God. The Soul is immortal. re-incarnation exists for the growth and development of the Soul and as such the unfulfilled Soul will return in a few years - each stage higher than the next - to continue the work that it needs to do.
Death - as we know it - is a shift from the sitting room to the bedroom. When the traveller is tired, it needs to take rest. Death is a temporary stop on the sojourn of life.