Daniel Dennett's seven tools for thinking - America's foremost cognitive philosopher shares some life lessons

Daniel Dennet the consciousness philosopher goes for the practical - some rules of thumb for navigating the complexities of rhetoric and analyzing presentations of ideas.

"This, by the way, is another reason why we humans are so much smarter than every other species. It is not so much that our brains are bigger or more powerful, or even that we have the knack of reflecting on our own past errors, but that we share the benefits our individual brains have won by their individual histories of trial and error.

I am amazed at how many really smart people don't understand that you can make big mistakes in public and emerge none the worse for it."

Daniel Dennett's seven tools for thinking


"A deepity (a term coined by the daughter of my late friend, computer scientist Joseph Weizenbaum) is a proposition that seems both important and true – and profound – but that achieves this effect by being ambiguous. On one reading, it is manifestly false, but it would be earth-shaking if it were true; on the other reading, it is true but trivial. The unwary listener picks up the glimmer of truth from the second reading, and the devastating importance from the first reading, and thinks, Wow! That's a deepity.

Here is an example (better sit down: this is heavy stuff): Love is just a word.

Oh wow! Cosmic. Mind-blowing, right? Wrong. On one reading, it is manifestly false. I'm not sure what love is – maybe an emotion or emotional attachment, maybe an interpersonal relationship, maybe the highest state a human mind can achieve – but we all know it isn't a word. You can't find love in the dictionary!

We can bring out the other reading by availing ourselves of a convention philosophers care mightily about: when we talk about a word, we put it in quotation marks, thus: "love" is just a word. "Cheeseburger" is just a word. "Word" is just a word. But this isn't fair, you say. Whoever said that love is just a word meant something else, surely. No doubt, but they didn't say it.

Not all deepities are quite so easily analysed. Richard Dawkins recently alerted me to a fine deepity by Rowan Williams, the then archbishop of Canterbury, who described his faith as "a silent waiting on the truth, pure sitting and breathing in the presence of the question mark".

I leave the analysis of this as an exercise for you."