In Parshat Vayakhel, it describes that the frame of the Tabernacle was constructed of “shittim wood, standing.” The talmud offers several explanations of this phrase. The first and simplest is that it refers to the orientation of the planks used in the construction; they should be vertical rather than horizontal. Another interpretation is that “standing” means that they are standing to this very day – the Tabernacle has been hidden away, but has not been destroyed. R’ Baruch Simon cites a number of sources who contrast this to the Temple, which was burned to the ground. Why will the Tabernacle stand forever while the Temple has been destroyed?
He explains that the Temple was largely constructed by the hired labor of Tyrean craftsmen who were working for money, not for the sake of the task itself. Their hearts weren’t truly in it. However, the Tabernacle was built by Jews themselves, out of commitment and love of G-d. Our accomplishments are most likely to endure when they are done in this fashion, with dedication and for their own sake.