(Based on a teaching from the Be'er Mayim Chaim.)
The mishkan, the dwelling place of the Shekhinah (the divine presence), was comprised from the individual portions of every single Jew. Each contributed the raw material based on "what their hearts desired." Everyone was extremely wealthy with wagon-loads of riches from the gifts of the Egyptians, yet not all contributions were the same. Of the thirteen materials needed for the mishkan there were expensive metals, like gold and silver, and beautiful fabrics, like turquoise and scarlet wool; there were somewhat grotesque materials, like goats' hair and ram skins; and there were plain materials like wood and oil.
From the unique contribution of each Jew, we amassed exactly what was needed, and everyone contributed a necessary part of the completed structure. No one was told which of the thirteen kinds of gifts they should bring, and people didn't fight or argue about their gifts. Those who contributed goats' hair didn't complain about bringing goats' hair instead of gold; they felt proud of their goats' hair. At the end, it worked out perfectly; if one person's contribution were missing, then the entire mishkan would have been incomplete, and the Shekhinah could not have dwelled; the heart's desires from each person came together and completed the whole.
The actual creation of the vessels from the raw material, however, was not done by everyone. It was the few individuals, of whom Hashem says, "in the heart of all who are wise of heart I placed wisdom," that created the vessels. And after all this was done, the midrash says, it was Moshe alone who erected the completed mishkan.
This teaches us an important lesson, that every Jew has a unique aspect with which they contribute to Hashem's presence in the world. Some contributions are apparently low and simple, others grandiose, but each and every one is needed. We need not look at what an other is doing and try to imitate those ways, nor does any need to pull others to join on their particular path of holy service; each of us just needs to find the unique portion of G-d in the deep recesses of the heart and live according to the necessities of bringing that gift into the world.
It may seem that there is much conflict of opinion, and each person is rejecting the values of the other. Each one thinks "I have the right path" or "My portion is the best." They are all right, each is the truly best portion for that particular individual, and without each choosing his or her portion, the structure would be incomplete and the Divine presence would be unable to dwell in the world. It is okay if the diverse sects seem to reject each other, and it is not necessary for a person to see how it all fits together.
Only those who Hashem blessed with a mind in the heart, who are bothered by the disunity and yearn for completeness, can put the many pieces together. If you feel this need for completeness and are not satisfied by merely contributing your own piece in the world, and truly seek peace in the world, then you are commanded to be a "builder of vessels." You must first see the good in each individual and perceive how each one contributes to the whole, then you must create a reality where this is achieved. It is not your job to go around the world preaching to each person how they have to accept everyone else's viewpoint-not everyone is blessed with your heart and mind. All you are required to do is get together with like-minded people and create a miniature messianic reality showing how it can also work on a grand scale. Then when the vessels are completed and the raw material of each individual is put to use in workable form, Moshe will come and erect the mishkan, he will reveal this truth in the entire world. As the Zohar says "Moshe - this is Moshiach."
Today the construction industry is extremely weak, but it has amazing potential for growth. Those who are dedicated builders are few and scattered, and many who try on their own quickly lose resolve when they see that no one else is interested in building. We need to get together and strengthen each other. Reb Shlomo says "You know why there is so much evil in the world? Because the people who are out to destroy are the ones who have their act together; But us? - we just don't get together enough." So please, if you are a builder, we (including we the students of Yeshivat Bat Ayin) are looking for you. Help us put together these vessels, and step by step we will complete the structure so the world has its house back and all people will be able to dwell together under one roof.