Watermelon seed
In my first pastorate in Alabama, we had a Sunday night watermelon fellowship. We fellowshipped together eating watermelon. During our time, we began a watermelon seed-spitting contest. Unknown to us, a few seed made their way into the soil between a brick wall and the driveway. A few weeks later we had watermelon plants growing in the drive. A few months later we were eating watermelons harvested from those plants.
You will never harvest cantaloupes or tomatoes from a watermelon plant. It will always be a watermelon. In the same way, God’s Word always produces spiritual results. Many will imitate the spiritual but their “fruit” will not be godly.