Vayikra
I think (please correct me if I'm wrong) that the first korban that Israel is commanded in is the Pesach lamb. (Tha patriarchs, and others, offered sacrifices before that, but I think this was the first commanded one.) The korban and its public after-effects, the blood on the doorposts, were necessary to get us out of Egypt. They were essentially private offerings (one per family). After this the priestly system took over, with the priests acting as agents for Israel.
Today we don't offer korbanot; we offer prayer instead. Since prayer replaced korbanot, can we take any lessons from the text about korbanot and apply them to prayer?
The big thing I notice is that the korban was a joint activity: the individual brought the animal (or grain or fruit) and the priest provided the ritual. Both are needed: without the individuals the priests have nothing to do, and without the priests the individuals can't do much. It's like this with prayer too: we have leaders who act as facilitators, but we are each individually responsible for doing our parts. The person on the bimah can lead us in the right words, but we have to bring our intentionality. Either one by itself isn't enough. Our tradition does support individual prayer, just as Israel was individually commanded in the Pesach korban, but in neither case can we act only individually. It's not enough to stay home and be spiritual; we also have to come together and support each other.
[Approximation of the mini-d'var for tonight's minyan, mentally assembled on the drive home from work.]

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http://www.jewishreviewofbooks.com/publications/detail/endless-devotion
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