So common has been the thread of worsening situations before the grace of God breaks through that I wonder how many others would have been responded to the love of God had our level of praying for them been maintained. (Brian Mills, Three Times Three Equals Twelve, page 109)
What does thread mean in the above sentence?
I need native speakers' help.
It's a metaphor referencing weaving, meaning a connected series of events.
When weaving, you interlace threads to create the cloth. Here the thread holding everything together is a series of worsening events.
Wear short sleeves! Support your right to bare arms!