It's lucky no one else knows what our most secret thoughts are.

Now and then he would smile, as though enjoying some dark secret thought.

You see, he had access to my most secret thoughts.

There was always the fear of their secret thoughts being known and exposed.

He stood frowning for a moment as at a secret thought.

But in her secret thoughts she knew how much it hurt him.

He never wanted to share his secret thoughts with him.

What would the world be like if secret thoughts were heard by others?

Her mother has secret thoughts about this too, she said.

It's just as well to let those secret thoughts out into the open.