The Kobriner Rebbe zy”a explains that travel often leads one’s mind to become unsettled, which can lead to an inability to serve Hashem properly. Therefore, staying in one place is more conducive to serving Hashem in a settled, composed manner. This is hinted to in the pasuk that says that when the Mishkan traveled, the Leviim “took it down”, hinting that traveling leads to a lowering of ruchnius, whereas when it rested, they “put it up”, hinting that staying in one place creates an increase in ruchnius.
The Ropshitzer Rebbe zy”a says that this is hinted to in Tehillim. The Mizmar that begins “ashrei yoshvei veisecha” (Tehillim 84), concludes with: “tehilas Hashem yidaber pi” (my mouth will speak praises of Hashem), which indicates that remaining in one’s home leads to a high level of avodas Hashem. On the other hand, the Mizmar that begins “ashrei temimei derech” (praiseworthy are those on the perfect road, ibid:119) concludes with the words “I went astray like a lost lamb”, indicating that traveling leads to spiritual difficulties.
וּבִנְסֹעַ הַמִ ּשְ ׁכָּן יוֹרִ ידוּ אֹתוֹ הַלְוִיִּם וּבַחֲנֹת הַמִ ּשְ ׁכָּן יָקִימוּ אֹתוֹ הַלְוִיִּם וגו' (א, נא)
And when the Mishkan traveled, the Leviim took it down. And when the Mishkan rested, the Leviim erected it. (1:51)
