For decades I’d seen in evangelistic tracts and literature the drawn image of a cross spanning a chasm of flames. The flames represent hell. Heaven is on the other side of the chasm. There is only one way to get from this side to the other. Those who walk the way of the cross are safe from eternal destruction.
Only recently did I learn the image of the bridge dates to the 1300s when St. Catherine of Sienna first put forward the idea of the Cross as a Bridge across a powerfully flowing river, which represents sin and hell. I write about it here:https://thecontemplativecatholicconvert.blogspot.com/2020/01/the-only-bridge.html
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