It is for this reason, that when we need to mark something important, we do it over a seven-day period. When, G-d forbid, a family is mourning the loss of a loved one, they need to realize on Monday, that today’s Monday is different from last week’s Monday. On Tuesday they need to realize that it is not the same as last Tuesday, and so on, for an entire week. The same applies in joyous circumstances, at a wedding. We need to realize that life the way we knew it has changed (for the better!). We truly internalize this when it is emphasized for an entire "seven days of the cycle."

According to Kabbalah (Jewish mysticism), G-d created the world with seven divine attributes. They are: Kindness, Severity, Harmony, Perseverance, Splendor, Attachment and Royalty. Accordingly, the entire creation is a reflection of these seven attributes.

The seven attributes (Midot) are:

Chesed (Kindness) is the quality which causes one to give to those who are undeserving. We all are beneficiaries of G-d's Chesed every day.

Gevurah (Severity). G-d's attribute of discipline and justice.

Tiferet (Harmony) is the ability to synthesize differing, and often opposing, ideas and emotions.

Netzach (Perseverance) is a person's drive to succeed. The power that motivates a person to complete a project which he/she has begun despite opposition from within and/or others.

Hod (Humility) -- the name speaks for itself.

Yesod (Foundation) is the attribute which allows you to establish a relationship with one who is lower than yourself (intellectually or otherwise) and give of yourself to that person.

Malchut (Royalty) is the exact opposite; it is the attribute which allows you to establish a relationship with one who is greater than yourself (intellectually or otherwise) and receive from that person.