The authors of Provers often drew comparisons to make their points. This is precisely what this author does here. He compares wood in a fire to gossip.
We should all pay attention here. Fire requires fuel in order to burn. One of the most common fuels used is wood. In the same way, certain things delay the endinng of a conflict. One of the most common things is gossip.
What can we learn from this? Just as wood builds up a fire, gossip builds up conflict. We can all resolve to avoid gossip. Instead, let's choose to keep what we hear in confidence. In doing so, we may gain a friend.