In other words, anything that one does, any construction, and a construction means it is something sustainable, such as when a person does some corporeal lust, the lust is not regarded as a construction because it is only temporary. When the lust passes away, nothing is left of it, such as eating and drinking, and so forth. But when one learns or prays, this exists after the action, too.

This is called a “construction.” However, that construction is not for one’s own sake, but rather another dwells in it. In other words, he builds the building for another. Like a contractor builds houses for other people, one who engages in Torah and Mitzvot [commandments] for others, it is called Lo Lishma [not for Her sake]. It follows that it is not for himself.

But in the future, he will not build so that another will dwell. That is, when a person engages in Torah and Mitzvot Lishma [for Her sake]—meaning that now he engages in Torah and Mitzvot in order to achieve Lishma, and he will be rewarded with the quality of Lishma afterward, which is called “in the future”—there the building, meaning the Torah and Mitzvot, will not be built so that another will dwell in it. Rather, he himself will dwell in it because the engagement in Torah and Mitzvot is for his own purpose.

We should also say that when one works for the purpose of this world, meaning in order to receive, he cannot enjoy it because there is a Tzimtzum [restriction] on reception. It follows that “another will dwell in it.” That is, through the exertion he is making, it is so that, as it is written, “If he is rewarded, he takes his part and the part of his friend in the Garden of Eden.” That is, one who is rewarded with entering the Garden of Eden takes the labor that others labored in Torah and Mitzvot.

This is considered that they are raising the Torah and Mitzvot of the general public, as in “A thousand enter a room, and one comes out to the light.” But in the future, one who exerts to achieve Lishma, meaning the aim to bestow, will be rewarded with receiving the reward for the labor he had made. It follows that he himself will dwell in it.