In Luke 20 the Sadducees ask Y'shua a 'gotcha' question about resurrection and marriage. He replies that in the resurrection there is no marriage. Why? Perhaps because humans are a two stage life form like butterflies or mayflies. They live part of their lives in one form and environment and then transition to a different shape and environment. Just as the larval stage in a river is fundamental to a mayfly, so birth and life on this earth is fundamental to humans.
