Undiscovered Sin

I find it humorous sometimes the things that pop out of Scripture on a particular day.  Today it was the fact that Moses took his wife and family with him to Egypt.  I've known that Moses was married.  But, I always assumed Moses traveled the road to Egypt alone...just him and God.


There's a quirky little passage towards the end of Exodus 4.  In the midst of Moses' obedience - as he's on his way back to Egypt to confront the Pharaoh and ask for the release of the Hebrew people, God confronts Moses.  With little to no explanation in the text, it says that God confronted Moses when he had stopped for the night...and was about to kill him.  WHAT?!  Moses was in the middle of doing God's will.  Why would God kill him?  God is God...and He knew all along that Moses had not circumcised his son.  So, why didn't God confront Moses on this issue from the burning bush, or at some other point before now...when Moses is at the proverbial tip of the sword?  Zipporah, Moses' wife, seems to get it immediately.  She takes a sharp rock and circumcises their son, which puts an immediate end to God's confrontation.  How did she know?  


Circumcision was the mark of the Abrahamic covenant, a sign that the people of God were walking after the Spirit, not after the flesh - that's why God had them cut away the flesh.  It seems that Moses did not "man up" and have his own son circumcised.  Was it a conflict between him and Zipporah?  Was this "mark" a source of marital conflict for the two of them?  There is little else in the text, except that she threw the bloody foreskin at Moses' feet and made a seemingly sarcastic, angry comment about Moses being a bloody husband to her.  


Matthew Henry's commentary on this passage helped to shine a bit of light onto the subject at hand for me:
"...when God discovers to us what is amiss in our lives we must give all diligence to amend it speedily, and particularly return to the duties we have neglected. The putting away of our sins is indispensably necessary to the removal of God’s judgements. This is the voice of every rod, it calls to us to return to him that smites us."


What undiscovered sin is present in my life?  What does God need to uncover in my heart?  May I not ignore His voice.