We now proceed with the final stage of the marriage ceremony, the nisu'in, which is effected by the chupah and the recitation of Sheva Brachot -- the "Seven Benedictions."
It is customary to honor friends and relatives with the recitation of these blessings. The honorees approach and stand beneath the chupah, where they are given the cup of wine which they hold while reciting the blessing.
The first blessing is the blessing on wine, and the remaining six are marriage-themed blessings, which include special blessings for the newlywed couple. The bride and groom once again sip from the wine in the cup.
At this point the souls of the groom and the bride reunite to become one soul, as they were before they entered this world. Included in the Seven Benediction is the blessing to the bride and groom that they discover that same delight in one another that they knew in their pristine, primal state in the Garden of Eden.
A cup is then wrapped in a large cloth napkin, and placed beneath the foot of the groom. The groom stomps and shatters the glass. The shattering of the glass reminds us that even at the height of personal joy, we must, nevertheless, remember the destruction of Jerusalem, and yearn for our imminent return there. As the glass shatters, everyone traditionally shouts: "Mazal Tov!"
These sounds resound through the couple's married life. When your husband "breaks something" during your life together; when your wife "breaks something" in the years to follow, you too should shout, "Mazal Tov!" and say: "Thank you G‑d for giving me a real person in my life, not an angel; a mortal human being who is characterized by fluctuating moods, inconsistencies and flaws."
For more detailed coverage of this subject, see Finalizing the Nuptials in our Wedding Handbook.