John 15:26-27 NRSVue
26“When the Advocate comes, whom I will send to you from the Father, the Spirit of truth who comes from the Father, he will testify on my behalf. 27You also are to testify, because you have been with me from the beginning.
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Some thoughts on this scripture
To testify and bear witness to something, I must have personal experience, so that I can say: /This is true, and I know it./ Lord, I have not been with you from the beginning. I am one of those who did not see and yet believed. Show me yourself, strengthen your spirit in me, so that my life and my words may testify to you.