We are taught that had Moses led the Jewish people into the Land of Israel, its conquest would have been virtually effortless. The intensity of Moses’ holiness would have neutralized any opposition. The same would have been true of our “conquest” of the world’s materiality: Moses’ entry into the Land of Israel would have made our task of elevating and refining the world virtually effortless.
This is the inner reason why G‑d did not allow Moses into the Promised Land. G‑d wants to shower us with infinite goodness. But were He to do so freely, without requiring us to “earn” it, we would feel ashamed. Thus, His desire to be good to us would backfire. Therefore, G‑d made the bestowal of His infinite goodness dependent upon our efforts. When we summon our hidden potential in order to overcome obstacles to the Divine mission of perfecting the world, we earn G‑d’s infinite goodness.1
The teaching of today, for me, is how Joshua has been sworn in. How do we know that he has been sworn in? Because now is Joshua, the one whom G-d speaks to. Admired and most beloved Moses Rabbeinu is no more physically among the Jewish people. I think it's also worthy to draw attention to the way the Rabbeinu dies, with G-d Himself at the entrance of the tabernacle.
And G-d commanded Joshua "Be strong and courageous!
In Dev, 32:49-50 G-d speaks to Moses, saying that he must go from the mount where he is now and to go to another mount from which he will see the beautiful land of milk and honey he has sworn to His people.
Then we reach line 50,
50 And die on the mountain upon which you are climbing and be gathered to your people, just as your brother Aaron died...
For me this has a very special meaning; I know that I have to die going up the steep mountain that is to approach God through the Torah.
And that is it: the purpose of my effort.