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I never predict anything, and I never will.

I can't predict the future.

Never make predictions, especially about the future.

One of my few shortcomings is that I can't predict the future.

I stopped predicting the future a long time ago.

I can't predict the future and I don't have respect for people who try to.

Prediction is very difficult, especially if it's about the future.

I never have plans for the future as you never know how things will turn out.

I have an abundance of enthusiasm; however, it would be foolish to think I can predict a future that doesn't exist.

You can never properly predict the future as it really turns out. So you are doing something a little different when you write science fiction. You are trying to take a different perspective on now.