Jewish tradition exhorts us to properly mourn the passing of a loved one, and sets the practices and rituals that facilitate and give expression to our feelings of loss and grief. At the same time, however, it establishes a sequence of time frames through which the intensity of our mourning is progressively mitigated, from the most intense mourning that is observed in the hours after a death, to the seven-day "shivah" observed following the burial, to the 30-day shloshim period, and so on.
Mourning is a show of respect to the departed and to his or her place in our lives...
In other words, we must mourn, but we must also set boundaries to our mourning. To not mourn at all, or to plunge into an abyss of grief and remain trapped on its bottom--both these extremes are detrimental, both to the living
and to the soul of the departed. Mourning is a show of respect to the departed and to his or her place in our lives,
as well as a crucial stage in the healing of those who experienced the loss. But the soul of the departed does not desire that those remaining in this world remain paralyzed by grief. On the contrary, the soul's greatest benefit comes from its loved ones' return to active, even joyous life, in which their feelings of love and veneration translate into deeds that honor the departed soul and attest to its continuing influence in our world.
Five phases of mourning correspond to five stages of the soul's ascent
These (five) phases of mourning also correspond with the stages of the soul's "ascent," as it gradually disengages from the material world and assumes a less palpable--though no less real--presence in our lives.
The world was created with humanity as its focus. This took a full cycle of time: seven days. When creation is reversed and the human soul returns to its source, that, too, is marked with a week's cycle: the Shivah, seven days which the closest relatives devote exclusively to mourning the soul's departure, and the extended family, friends and community comfort them with their presence, their empathy, and their words of consolation.
we must mourn, but we must also set boundaries to our mourning
The traditional words spoken to the mourner during Shivah are: "May G‑d console you, together with all mourners of Zion and Jerusalem." In a letter to a father who lost his young child, the Lubavitcher Rebbe writes:
"At first glance, the connection between the mourner to whom these words are directed and the mourners of Jerusalem's destruction appears to be quite puzzling. In truth, however, they are connected. For the main consolation embodied by this phrase is in its inner content. Namely, that just as the grief
over Zion and Jerusalem is common to all the sons and daughters of our people, Israel, wherever they may be... so is the grief of a single individual Jew or Jewish family shared by the entire nation. For, as the Sages have taught, all of the Jewish people comprise one integral organism...
"A second point: ...just as G-d will most certainly rebuild the ruins of Zion and Jerusalem and gather the dispersed of Israel from the ends of the earth through our righteous Moshiach, so will He, without a doubt, remove the grief of the individual, fulfilling the promise embodied by the verse, 'Awaken and sing, you who repose in the dust.' Great will be the joy, the true joy, when all will be rejoined at the time of the Resurrection of the Dead...."