a thread
Examples
He who holds me by a thread is not strong; the thread is strong.
He, who every morning plans the transactions of the day, and follows that plan, carries a thread that will guide him through a labyrinth of the most busy life.
Habit is a cable we weave a thread of it every day, and at last we cannot break it.
A thread from everyone will make a shirt for the needy.
Every day a thread makes a skein in the year.
A thread will tie an honest man better than a chain a rogue.