Quotes from Iain M. Banks

The truth is not always useful, not always good. It's like putting your faith in water. Yes, we need the rain, but too much can sweep you away in a flood and drown you. Like all great natural, elemental forces, the truth needs to be channeled, managed, controlled and intelligently, morally allocated.

There's an old Sysan saying that the soup of life is salty enough without adding tears to it.

Why had he done it? Why couldn't it just not have happened? Why didn't they have time-travel, why couldn't he go back and stop it happening? Ships that could circumnavigate the galaxy in a few years, and count every cell in your body from light-years off, but he wasn't able to go back one miserable day and alter one tiny, stupid, idiotic, shameful decision...

Stories set in the Culture in which Things Went Wrong tended to start with humans losing or forgetting or deliberately leaving behind their terminal. It was a conventional opening, the equivalent of straying off the path in the wild woods in one age, or a car breaking down at night on a lonely road in another.