Wine symbolizes the "joy of life."  Tonight we drink wine four times during the seder, representing God's four promises to the Israelites of redemption from slavery, which are mentioned in the Book of Exodus (Chapter 13):

  1. "I will free you."
  2. "I will deliver you."
  3. "I will redeem you."
  4. "I will take you to be My people."

haggadah Section: Kadesh