Kazuo Ishiguro - And what made these heart-to-hearts possible--you might even say what...

And what made these heart-to-hearts possible--you might even say what made the whole friendship possible during that time--was this understanding we had that anything we told each other during these moments would be treated with careful respect: that we'd honor confidences, and that no matter how much we rowed, we wouldn't use against each other anything we'd talked about during those sessions.