Here is a short glimpse into what I see as part of the spiritual battle in which every Christian is involved yet too often is ignorant of. I remember preparing a sermon from a passage that is blatantly gospel-centered (Philippians 2:1-11). An easy sermon to prepare right? Wrong!
My mind was tortured and fractured. I had a terrible time even concentrating for more than a minute or two. I would type a few words and then find my mind going blank. I stared at the screen, looked at the passage, talked out loud, prayed and nothing came. I found that there was a growing tension in my hands so that I could not even type consistently, with constant misspells. Then there were the interruptions, not many, but they came only at the times when my mind seems clear and focused.
I love the gospel. I know the gospel is the only means by which God has ordained sinners to be saved. I rejoice in the truth that there is much salvific power in the proclamation of the gospel. And I know that Satan despises it. This battle takes place every time I am preparing an overtly evangelistic sermon. This last time it just seemed much stronger.
I would suggest that the same is for any who is contemplating speaking to others about Jesus.