Another interpretation: lest you say their hope is lost and their prospect annulled, the verse therefore teaches "standing," meaning they endure forever and for all eternity. With all the commandments, a person fulfills them only in the manner of their growth, as it is said, "acacia wood, standing up," and so on.
The Mitzvot Stand Forever Like the Acacia Boards
Yalkut Shimoni on Torah 371:4
דָּבָר אַחֵר, שֶׁלֹּא תֹּאמַר אָבַד סִבְרָן וּבָטַל סִכּוּיָן, תַּלְמוּד לוֹמַר עֹמְדִים, קַיָּמִין לְעוֹלָם וּלְעוֹלְמֵי עוֹלָמִים. כָּל הַמִּצְווֹת כֻּלָּן אֵין אָדָם יוֹצֵא בָּהֶן אֶלָּא דֶּרֶךְ גְּדִילָתָן, שֶׁנֶּאֱמַר עֲצֵי שִׁטִּים עֹמְדִים וְכוּ'.