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Science progresses best when observations force us to alter our preconceptions.

We want the facts to fit the preconceptions. When they don't it is easier to ignore the facts than to change the preconceptions.

The main advantage of the omniscient approach is that it's the easiest to handle. That's the major reason so many writers select it.

Every disadvantage has its advantage.

With any work worth its salt, you have to trust the author enough to take its measure. And if you apply too many preconceptions, you are not taking its measure.

To know ahead of time what you're looking for means you're then only photographing your own preconceptions, which is very limiting, and often false.

A good example is far better than a good precept.

I don't want preconceptions. I want to learn as much as possible.

To every disadvantage there is a corresponding advantage.

What SF can do better than anything else is show us the range of our possible futures, and what we can do to realize the good ones and avoid the nasty ones.