Carl for whatever reason i feel like you and I see eye to eye on a wide variety of issues but sometimes i think that you should spend time in prayer and get an answer from God yourself. Unless God is inspiring you to ask these questions publicly for a bigger purpose.
In my experience, everything in the spiritual realm operates by the spoken word.
So God created the universe by speaking it into existance.
Corruption came, and by our spoken words of confession of our corruption, we are forgiven. (And this is not by our physical mouth, but by our spirit speaking in the spirit).
The word of our testimony is all the words that we spoke, to or against God, the Son, the angels, humans, and demons that heard it.. but not all the words. its the words that were spoken in spirit and in truth and are spiritually relevant. In a sense its your whole spiritually relevant life story
Ultimately we all have to realize our physical lives have little to no value. But few figure that out in their own lifetime which is why the martyrs are commended.
Here is an example:
14 years ago i had a short conversation with an 8 year old girl who told me her mom had been shot. I will likely never meet her again, and for years i have wondered where she went, was it true what she told me, why did she seem to instinctually run down to the church basement away from everyone else and climb into a chair to sit next to me, etc. In a dream earlier this year i saw her, years ago, as a child, telling some of her friends how much what i told her helped her. What happened there is part of her testimony of Jesus, and mine.
Basically whatever is spiritually relevant in your process of overcoming the world is through Jesus and it is your testimony