He heard the woman's mental voice, but also his own.

His mental voice was a little sharp, Harry thought, and suddenly nervous.

And his mental voice was cold as the spaces between the stars.

She has got to stop doing this kind of thing, he thought, and his mental voice was almost conversational.

It was the other mental voice, the one with the different "flavor."

He is described as having a deep, rich mental voice.

There was less panic in his mental voice, and more anger.

The mental voices had never seemed so loud before, not even back on Earth.

That clear mental voice (think what you want) filled his head again.

I don't want I'm warning you, he said, and his mental voice was like ice.