Vayakhel-Pekudei tells the story of the construction of the Tabernacle, God's portable shrine among the Israelites. The plans which had been laid out in the previous three portions are now implemented- Moses solicits gifts from every segment of the community, designates and trains artisans, and supervises the construction. This is an incredibly important project. And yet, before engaging in that process, Moses reminds the Israelites that they are to observe the Sabbath- that they are to labor for six days, and to rest on the seventh. Indeed, the Sabbath is connected with the Tabernacle in the previous week as well.
There are several possible reasons why these two concepts might be connected. On a basic level, we can understand that just as the Tabernacle is the physical locus where God's presence is felt, Shabbat is the temporal focus for God's presence. The Tabernacle represents the possibility of a perfected world, as does the Sabbath.
Our sages explain, however, that this connection has further implications. Despite the incredible importance of the Tabernacle as a national project, its construction does not override Shabbat, and indeed it is precisely those tasks which were essential to constructing the tabernacle which are forbidden on Shabbat! Perhaps we are meant to learn that no matter how important a project might seem at the time, we must remember that sometimes other things must take priority, sometimes we must take a break to refresh our souls, even if only so we can continue all the more once we have been refreshed.
We all have things that we regard as our highest priority. Sometimes we must take a step back and recharge. Even a project as important as seeking God's presence in the physical world will not succeed unless we occasionally drop the physical and embrace the spiritual.
Try building yourself by putting down your tools: Next shabbat is the National Day of unplugging. http://www.sabbathmanifesto.org/unplug/