There is no way in this world to fathom the sheer good the soul will experience in the World to Come. In this world we only know and desire physical good. But the goodness of the World to Come cannot be compared to the good things of this world except in a figurative sense. There is no way to compare the good of the soul in the World to Come to the physical enjoyments of this world. That good is infinitely greater with nothing like it. King David had this in mind when he said, "How abundant is the good that You have in store for those who fear you!" (Psalms 31:20).
[8:7] King David deeply craved life in the World to Come, as can be seen from the passage, "Had I not the assurance that I would enjoy the goodness of God in the land of the living. . ." (Psalms 27:13). The Talmudic Sages have already told us that man is unable to grasp the full extent of the goodness in the World to Come. No one can know its greatness, beauty, and impact, except God alone. The wonderful things the prophets foretold for Israel do not refer to the reward in the World to Come. Rather, their prophecies involve only the physical delights that Israel will enjoy in the Messianic age when supremacy over the world will be given to Messiah (the anointed one,) King of Israel. Even the Messianic period cannot compare to the goodness of life in the World to Come. The prophets did not describe it, for fear their descriptions would not do it justice. Yeshayahu explained, saying, "No eye has ever seen, 0 God, except for You, what You will do for those who trust in You." (Yeshayahu 64:3). This means, the goodness of the World to Come which was never seen by a prophet, and was only, seen by God, and was created by God for those who trust in Him. The Sages said, the prophets prophesied only about the Messianic Age. "No eye has ever seen, 0 God, except for You," the goodness of the World to Come.
[8:8] The Sages, when using the expression "The World to Come," do not imply that it does not exist now, and will come into existence only when this physical world is destroyed. On the contrary, the World to Come already exists, as it is written, "How abundant is the good that You have in store for those who fear You... which You have made." (Psalms 31:20). It is called "the World to Come," because a person enters that stage of life only after his life in this world3, where he exists as a combination of body and soul, has come to an end. This physical life is his first stage, giving him the opportunity to earn a share in the World to Come by choosing to follow in God's ways.
3 After death, a righteous soul enters the Garden of Eden and waits there for the period of the Rising of the Dead, and thereafter, the World to Come. From the wording of Maomonides, it appears that he names this whole process the World to Come.