The essential idea of the attack is to trick the target into providing the answer to its own challenge.

That is the essential idea of the whole thing.

I'll talk mostly about music, but I believe the essential ideas are applicable to the visual arts and beyond.

The essential idea of an umbrella is breadth and protection.

The essential linguistic idea behind it is that which comes at night and calls attention.

But she has not omitted a single essential idea.

What is the essential idea that gets me out of bed and through the day?

I think that this is an essential idea which we must develop.

These few elements show the essential ideas of the much larger original resort plan.

They are complex, essential social ideas, for which many people have spent lifetimes fighting.