main current

[user_gary]

perpetual --- main current of thought or behavior.


What does `main current' mean in the above?

[Anglika]

A river has a main current that takes most of the water down it, with subsidiary currents where the flow is interrupted.

So, the "main current of thought/behaviour" is the line of thought/behaviour most generally used.

However, Perpetual means "never-ending/continual".