"Do not light a fire in any of your dwellings on the Sabbath day."
From this I drew the conclusion that fire represents destruction. However, on the Sabbath day, God wants us to reflect on creation. Destruction is obviously creation's opposite.
I also pondered a secondary meaning. Fire represents anger, wrath or rage. I believe God also wants us to observe a spiritual principle of avoiding anger on that day or avoid making others angry especially through our words.
I also see a third principle in this text of scripture. Wrath or anger came after sin was introduced into the earth. Thus by not lighting fires on the Sabbath, we get to really focus on the state of the earth before sin.
My daughter and wife has 24 hours access to me on the Sabbath, except when I am sleeping or they are sleeping. The Sabbath is a time that I make myself fully available to them.
I concluded that because of my position as male and head of the house, this must reflect something about God and his relationship with humanity. I concluded that the Sabbath at creation allowed humanity to have 24hour access to God. After sin, we lost physical access to God. However, the Sabbath in picturing future reality (see Hebrews 4:9 and 11) represents a time when all humanity will have restored 24 hours of access to God, as he will be our God and dwell in our midst.
As Isaiah 66:23 states:
And it shall come to pass, that from one new moon to another, and from one SABBATH to another, shall all flesh come to worship before me, saith the LORD.