They join roots with each other. Cut the roots between one and the one next to it. So it is with the Body of Christ. When we criticize and condemn each other we are really damaging ourselves. A fire couldn't get through that even if it wanted to.
Sequoia bark has an asbestos quality to it, resisting fire as well.
Early settlers in California knew this and enjoyed the burn resistant redwood on their homes. As resistant as these mammoth trees are, without fire in the forest, some bad things can happen to these gentle giants. Fire cleanses the forest of underbrush and smaller trees. The heat from forest fires causes growth, but the heat from the flames also causes the Redwood seedcones pop open, dropping to the floor below. No new trees have been growing in the National Parks because other smaller trees are taking up what little is left of the sunlight and nutrients and the leaves of the smaller trees are blocking the tiny Redwood seeds from being able to push through them to sprout.