Dr. John MacArthur (transcript from a sermon):

The law of the Lord is perfect, comprehensive, sufficient for the total transformation of the whole inner person.

Whenever I preach this (Psalm 19:7), I always think of this one man named Tim Evalina. I was preaching in Sebring, Florida many years ago. And at the end of the message that I gave in this church, he came up to me, introduced himself. He said, “I have to tell you my story.” He said, “My entire family are Jehovah’s Witnesses. In fact, my family is responsible for the leadership of the Jehovah’s Witnesses throughout the state of Florida. My job” – he says – “is, has been for years, to train all the Jehovah’s Witness leaders. I go from location to location to location training them.” But he said, “I have to tell you what’s happened to me.”

He said, “I was driving across Florida listening to the radio in a rental car; and I turned on the radio, and you came on. I didn’t know who you were. And you made one statement. You said, ‘Jesus is God.’ And I said, ‘That’s a lie,’ and turned it off. And then I turned it right back on again because I was curious. And you went on to show from the Bible that Jesus is God. That was on a Monday.” And Grace To You happens to be all over Florida, so if you keep moving you can find us. He said, “I listened five days that week to your program, and all week you were showing that Jesus is God. By Friday I was seriously grappling with that issue, because Jehovah’s Witnesses do not believe that.

“Monday was the second week of the series, I listened five more days. Friday I knelt down beside a bed and I said, ‘O God, Jehovah, whom I thought I served, if indeed Jesus is God the Son, show me.’ That night my head was cleared, my heart was cleared, my soul was transformed, and I embraced Jesus Christ as my Savior.

“Now,” he said, “I had a problem, because I was going around training the Jehovah’s Witness leaders. So,” he said, “I had to do some retraining. So,” he said, “I started back trying to tell them all that Jesus is God. I was in odds with my wife, three sons, and my parents and extended family, and everybody in my whole world. I was called on the carpet, tried as a heretic, and excommunicated from the movement.” He said, “My life is transformed.”

You ask the question, “How do you reach a leader in the Jehovah’s Witness movement?” Just let the truth of Scripture do its mighty work. There’s no subtle way to do that. I can’t orchestrate that. He said, “Pray for my family. Please pray for my family.” This has only been a few weeks.

Got a letter from him some months later telling me his wife and all three sons were in Christ, they were redeemed. Serious dent in the JW system in Florida. This is only an anecdote, but it illustrates the amazing power of the truth to do its own work, energized by the Spirit in the heart. I always think of him when I think of that statement in verse 7.