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We are optimistic, but we are optimistic in a cautious fashion.

There's probably a little greater case for pessimism than optimism. But I do not rule out optimism.

At the end of the day, we must go forward with hope and not backward by fear and division.

Hope is definitely not the same thing as optimism. It is not the conviction that something will turn out well, but the certainty that something makes sense, regardless of how it turns out.

The inevitable has always found me ready and hopeful.

The progress of the natural sciences in modern times has of course so much exceeded all expectations that any suggestion that there may be some limits to it is bound to arouse suspicion.

We are both disturbed and fascinated by visions of bleak futures, predictions of what might come if we as a society aren't careful.

If I advocate cautious optimism it is not because I do not have faith in the future but because I do not want to encourage blind faith.

I hesitate to predict whether this theory is true. But if the general opinion of Mankind is optimistic then we're in for a period of extreme popularity for science fiction.

I'm interested in the hope we invest in science, and the disappointment we can feel when science flattens, or 'explains,' the larger mysteries of religion.