It's true, we have faith that Messiah will be here tomorrow, because he will come today, in the next moment. And if that's the case: Why build a house? Why plant a tree? Why teach a child?
This is the path that leads to the World to Come. At each stop, we do all that it demands of us. At each camp, we rebuild the Sanctuary, even if only for a moment.
Because every moment is a whole world, as precious as eternity.