There is danger when a man throws his tongue into high gear before he gets his brain a-going.

And I say also this. I do not think the forest would be so bright, nor the water so warm, nor love so sweet, if there were no danger in the lakes.

There is often less danger in the things we fear than in the things we desire.

Know that danger is lurking, when you see excessive sweetness, humility and simplicity.

Things never go wrong at the moment you expect them to. When you're completely relaxed, oblivious to any potential dangers, that's when bad things happen.

["The Devil in the Dark"] impressed me because it presented the idea, unusual in science fiction then and now, that something weird, and even dangerous, need not be malevolent. That is a lesson that many of today's politicians have yet to learn.