The preacher was speaking tongue-in-cheek when he complained, “My wife is absolutely unreasonable. She actually expects me to live everything I preach!” It’s so much easier to tell someone what is right than to practice it personally.
When my son and I play golf together, I can tell him exactly how to play the hole and hit the shots. But my own ability to hit those shots is sadly limited. I suppose this is what is meant when we refer to athletes who “talk the talk, but don’t walk the walk.” Anyone can talk a good game, but actually performing well is far more difficult.