Resurrection Purpose

 Sefer HaIkkarim (04:35) Hence Maimonides agrees that the main reward that God bestows upon man is conferred upon the soul and not upon the body. It seems, therefore, that the purpose of resurrection is not in order to reward the body, but either to give the individual an opportunity to acquire greater perfection than he acquired before, prevented as he was by external hindrances, exile, poverty and the like, and not through evil choice or any condition in the individual himself; or to make known in the world the great power of God and to publish the true faith. In this case resurrection may be confined to the righteous alone, as the Rabbis say, and will take place in the Messianic age.