It will be when you come into the land (eretz) that the Eternal, your G-d, gives you for an inheritance, and you will inherit it and dwell in it. (Deut. 26:1)
The Midrash notes that eretz is similar to ratzon (desire). When you attain the level of ratzon of G-d, you have been given a gift from above. It is an inheritance for every Jew.
(the Baal Shem Tov)
Because you did not serve the Eternal your G-d with joyfulness and gladness of heart...therefore you will serve your enemy. (28:47,48)
Rabbi Simcha Bunim explained the above verse as follows: It is not enough that "you did not serve the Eternal your G-d" but you did this with joyfulness - you were happy that you weren't serving Him!
You will be mad from the sight of your eyes which you will see (Deut. 28:34)
Coveting everything one sees is indeed a terrible curse, for it is the root cause of all the other punishments that are mentioned in this Torah portion, eventually leading to "you will be only oppressed and crushed always."
(the Rebbe the Tzemach Tzedek)
And all people of the earth shall see that you are called by the name of the L-rd, and they will be afraid of you (Deut. 28:10)
It is through the Jewish people that the nations come to fear G-d. Because "You are called by the name of the L-rd," your influence extends over all the peoples who observe you.
(Butzina Din’hora)
You shall go to the place the Eternal your G-d will choose to cause His name to dwell there. (Deut. 26:2)
A Jew must know that when he goes from one place to another, he is not going on his own but is directed from Above. And the intention and purpose of this is "to cause His Name to dwell there" - that is, to make G-d known in the place to which he was Divinely led.
(the Baal Shem Tov)