the thread of life in Greek myth of the three sisters one makes the string one pulls the string and one cuts the string that is the cycle of life.
When a particular thread has many dependent thread, and that particular thread is terminated, then all the threads that depends on that terminated thread will no longer belong to something and they will certainly mislead to their each functions. This is what it call orphan thread.
Thread
The Fate who spins the thread of life
The Scottish expression "like a knotless thread" means something that is smooth, easy, and effortless. It implies that a task or situation is simple and straightforward without any complications or obstacles.
Stiches is made in sewing with needle and thread
Sow is a word meaning to plant something. Its homophone is sew, or to use a needle and thread.
From the limited context; i would say that in this example, 'thread' means a small portion or part of. Thread of this belief would be synonymous with the smallest bit of this belief, for example.
Theseus used a ball of thread/string to find his way out. This was given to him by the princess Ariadne.
His betrayal of Araidne. She wished that he would forget to change his flags so his father jumped of a cliff after he thought he was dead.
it is depending on some very small thing whilst being at risk
A suture... is a surgical stitch to close a wound. Sutures are made of nylon thread.
Sow is a word meaning to plant something. Its homophone is sew, or to use a needle and thread.