I saw this Meshech Chochma on Shabbos and thought it very apropos (and it's a good vort to remember for Sukkos): When it comes to the mitzvah of aliya la'regel on Pesach and Shavuos, the Torah in Re'eh writes to go to the place "asher yivchar Hashem l'shakein shemo sham." However, when it describes the same mitvzah of aliya la'regel on Succos, it says to go to the place, "asher yivchar Hashem," but it leaves out the words, "l'shakein shemo sham." Why the difference?
Meshech Chochma answers that on Pesach and Shavuos we are judged respectively on wheat crops and fruit. The Torah adds the words, "l'shakein shemo sham," to remind us that unlike what the other nations think, there is no power other than Hashem that can influence what will happen to these crops. On Sukkos, when we are judged on how much water and rainfall will occur, we don't need a similar reminder. Even the nations realize that Hashem and only Hashem controls rainfall and water (he brings a number of proofs from various gemaras).