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On Shavuos we receive the Torah — our book of law and order. The Torah introduces concepts of limits. It turns out that not everything “goes.” We have to wait a certain time before eating dairy foods after eating meat. We have to stop for one day, once a week, and refrain from doing certain activities. We have to conduct ourselves so that our actions increase holiness and decrease a fixation with the material world. There are limits to our joy and limits to our sadness.