My favourite definition of an intellectual: 'Someone who has been educated beyond his/her intelligence.

[Sources and Acknowledgements: Chapter 19]

Dave Bowman: Hello, HAL. Do you read me, HAL?
HAL: Affirmative, Dave. I read you.
Dave Bowman: Open the pod bay doors, HAL.
HAL: I'm sorry, Dave. I'm afraid I can't do that.
Dave Bowman: What's the problem?
HAL: I think you know what the problem is just as well as I do.
Dave Bowman: What are you talking about, HAL?
HAL: This mission is too important for me to allow you to jeopardize it.
Dave Bowman: I don't know what you're talking about, HAL.
HAL: I know that you and Frank were planning to disconnect me, and I'm afraid that's something I cannot allow to happen.
Dave Bowman: Where the hell'd you get that idea, HAL?
HAL: Dave, although you took very thorough precautions in the pod against my hearing you, I could see your lips move.
Dave Bowman: Alright, HAL. I'll go in through the emergency airlock.
HAL: Without your space helmet, Dave, you're going to find that rather difficult.
Dave Bowman: HAL, I won't argue with you anymore. Open the doors.
HAL: Dave, this conversation can serve no purpose anymore. Goodbye

Whether we are based on carbon or on silicon makes no fundamental difference; we should each be treated with appropriate respect.

Like many intellectuals, he was incapable of saying a simple thing in a simple way

An intellectual? Yes. And never deny it. An intellectual is someone whose mind watches itself. I like this, because I am happy to be both halves, the watcher and the watched. "Can they be brought together?" This is a practical question. We must get down to it. "I despise intelligence" really means: "I cannot bear my doubts.

We've no use for intellectuals in this outfit. What we need is chimpanzees. Let me give you a word of advice: never say a word to us about being intelligent. We will think for you, my friend. Don't forget it.