And that got my eye going, so that today I was able to pinpoint what was bothering me about a letter my Dad had asked me to read. I had talked him out of sending it before the weekend because something about it bothered me. Today I found the problems. One word in one paragraph, and one sentence in another. When I figured it out and pointed it out to him, he agreed that the word wasn't really necessary, but thought that the sentence was. After pondering, he agreed that the sentence was redundant.
The letter is much stronger now, and says what he wanted to say.
He complimented me on my editing. Since he was a professional editor, he knows what he's talking about.