The Ramban answers that the parsha of the Mishkan shows G-d’s love for the Jewish people. The eigel had us down and out, but then Hashem have us this special gift to help us achieve kapparah and come back. Love for the Jewish people is something the Torah wants to elaborate on.
The Kotzker, however, takes the opposite position. Those of you who have been married for a few years can appreciate that sometimes all it takes is a glance or a small gesture to communicate to one’s spouse what would take a mouthful of sentences to get across to anyone else. Even I, the densest of husbands, can figure this out. When Klal Yisrael is close to Hashem, we are like a long married couple. Rabbi Akiva was able to figure out piles of halachos from even the crowns on each letter. He didn’t need G-d to spell things out – when you are close, you just know what the other person means. A similar idea: Chazal (Nedarim 32) tell us that had the first luchos not been broken we would have only needed the chumash and Sefer Yehoshua; all the words of musar from the Nevi’im would have been unnecessary. It’s when two people are distant that it seems to effort to communicate; it takes words upon words to connect. The cheit ha’eigel distaned us from G-d. A crown on a letter was not enough – we needed words and words to communicate, four parshiyos worth.
I have a good library and I know how to do research. Why are any Rabbis more qualified than me to decide halacha? An outsider reads a letter sent from a child in camp or in Eretz Yisrael to his/her parents and walks away thinking everything is OK – it says so right there in the letter. The parent reads the same letter and has a completely different reaction. “Oy, my Reuvain is depressed…. Oy, my Rivka is not eating enough…” And so you ask, “But where do you see that in the letter? It doesn’t say any of that?” And you would be right – only a parent, a husband and wife, someone who is really close, gets that message from a little postcard, but for you it would take four parshiyos and countless repetition. It’s not about having a good library, having a CD with more books and being able to do better research. It’s about being close.