“You are my witnesses…so that you may know and believe me and understand that I am he.” (Is 43.10).  

Even though Isaiah had been declaring the role of God’s chosen Servant, this statement means the role of leading out the blind and deaf (v.8) is now expanded to witnesses who believe, know and understand who God is.  Because true understanding of God only comes through belief, those who know and understand bear witness that He is God.  In fact, this passage seems to put God’s reputation into the hands of the ‘witnesses’.  He said, he has revealed, saved and proclaimed – but it is the job of the witnesses to prove He is God (Is 43.12).

I find it fascinating that the tense of these words indicates that the witnesses will know (and continue knowing), believe (and continue believing) and understand (and continue understanding) that God is the One, True God.  So, the more the witnesses act as witnesses of God, the more they grow in belief, knowing and understanding of Who God is.

Did you hear this?  How often do we delay saying or doing something because we “aren’t sure”?  How many times have we withheld from action because we are functioning from our reason rather than operating from soft-hearted belief?  This verse makes clear that when we are a witness of God we actually grow in belief, learning and understanding.

Think with me about this for a moment.  How often have you been in a place of spiritual dryness and then you got involved in conversation with someone asking about your faith.  It may have been a short chat, but simply by telling your story, recalling how God acted in your life, your spirit was elevated and the dryness you previously felt no longer held such a strong influence over your state of mind.  This is what happens as we are ‘witnesses’ of God.  By living in relationship with God, we prove who he is to others and, in doing so, increase our own belief and understanding of WHO he is.

It’s as if our hearts hear the words which contain the Life and Substance of God, recognise the nature of God and respond in faith – even if our hearts hear the story from our own mouths!  By being a witness, we grow in our belief, learning and understanding.

This is what Jesus wanted the people of his day to realise.  He wanted them to recognise that he was a witness of God.  Since they couldn’t accept his teaching, Jesus hoped they would hear the message through his miracles (Jn 10.38).  When they still didn’t get it, Jesus quoted this phrase from Isaiah, in a further attempt to help those who knew the Scriptures so they would believe, learn and understand that he was the Son of God.