From Ohr Avigdor Shaar Bitachon by Rabbi Avigdor Miller
Everybody will be rewarded according to what he deserves. An unstated reason for the lack of discussion of the World to Come in the Torah is related to the fact that there is no explanatory discussion of Hashem in the Torah. This is because human beings are unable to comprehend or describe Him. We just know that He is there. He is always around.
What is He? What does He look like? That’s is not for us to say, as it says, “No human can see My face and live” (Shemos 33:20). Even Moshe Rabbeinu wasn’t capable of seeing Hashem while he was alive.
We are unable to comprehend or describe Him — We just know that He is there
The World to Come is synonymous with Hashem. It represents a state of unearthly happiness of being together with Hashem. If you can’t describe Hashem, you can’t describe the World to Come either. Therefore, Moshe Rabbeinu wasn’t told what the World to Come looks like, because he couldn’t understand it while he was alive. All we can know about Hashem is that He has certain attributes of affecting His relationship with mankind.
For example, we know that He loves His nation Yisrael (Birchos Krias Shema). We also know that Hashem is righteous and acts with righteous justice. As for the World to Come, it says in the Gemara (Brachos 17a), tzaddikim don’t eat or drink in the World to Come. They sit with their crowns upon their heads and enjoy gazing upon the splendor of the Shechinah (Divine Presence). But exactly what that means it’s impossible to explain, and therefore there’s no purpose in discussing more about it.