"Who then, is this, that even the wind and sea obey Him?" (Mark 4:41)
He is true God, the creator of wind and sea, who does care that we perish (Mark 4:38) and does far more than the terrified disciples ask or imagine in their prayer. (In light of this passage, try and argue that answers to prayer depend upon you having a strong faith!)
But He is also true man, who is transported by a boat and sleeps; who is the promised offspring of Abraham (Genesis 12, Galatians 3:16) here to bless all the families of the earth.
Yet the blessing of His kingdom is endangered by Abram's plans to save his own neck with the infamous "She's my sister, Pharoah" event. For God is determined not to give the offspring to the families of the earth apart from the family of Abraham AND Sarah (though He has not explicitly said that yet.) So that the promised salvation does not die - and us die with it - God reunites Sarah to Abraham. Certainly we are saved by grace, and not only not by our works, but like Abram, DESPITE our works.
Our Father who art in Heaven, Thy kingdom come, Thy will be done. Amen.