What's the answer - the answer to the big question? A Christian knows the answer is Christ, the source of Life and the creator of the universe (and everything). Christ instituted the sixth and everlasting covenant (Matt 26:28), the way by which we have everlasting life. That is our one sure way to Him, to enter into this sixth covenant.
In Hebrew, the word for "swearing an oath" is the verb form of the word for "seven". (Hahn 2005) In other words, when you swear an oath to enter a covenant, you "seven yourself". Through the Old and New Testaments, God "sevened Himself" with His people in six different covenants*. Sevened into six covenents, or seven six times.
Douglas Adams was right after all.
Hahn, Scott. 2005. Letter and spirit: From written text to living Word in the liturgy. New York: Doubleday Religion.
* More seriously: the St. Paul Center for Biblical Theology offer a free online Bible study on the subject: Covenant Love. The list of covenants - worth remembering - is in lesson one, section III A.