The Gemara tells us: Kol she-tarach b'Erev Shabbat (before Shabbat), whoever works on Erev Shabbat, whoever prepares for Shabbat cooks and has a meal; yochal b'Shabbat, can eat on Shabbat. On Shabbat, a person cannot cook. But a person who is not busy cooking before Shabbat comes to Shabbat with nothing to eat, because he cannot make himself food on Shabbat.
The Gemara says: So too, in this world or the next world, whoever works in this world to prepare himself for the next world—whoever works with Torah and Mitzvot (commandments) to grab more Mitzvot and more Torah while he is alive, not wasting their time—they are going to have a meal in the next world. They are actually going to have a house in the next world.
In this world, if a person wants to build a house, he goes to Home Depot, he goes to Lowe's, he buys himself some wood, he has a construction company. In the next world, Home Depot is not going to help; neither will Lowe's, nor will a construction company. Money is not going to help. The only thing that's going to help is how much a person utilizes his time in this world to do Chesed (acts of kindness), to do Mitzvot, to keep Shabbat, to learn, to learn Torah, to help other Jews, to give, to daven to Hashem. That is the construction: to build a person's next world in Olam Haba (next world). Nothing else is going to help—only Torah and Mitzvot that a person grabs in this world.