How To Be A Liberal

1. BIRTH

On 10th November 1619, René Descartes had a nightmare. He was walking down a road in a violent storm and shadowy figures were following him. He couldn't keep a straight line. A weakness was affecting his right side and driving him constantly to the left. Strong gusts of wind kept spinning him around and preventing him from getting a sure footing. 

Ahead of him he could make out some gates and beyond that a church where he could flee the storm. But even when he went in the courtyard, the wind kept throwing him off balance. He saw a man he recognised and tried to say something to him. It was impossible. He couldn't stand upright. Then, slowly, other figures began to appear, all of them steady on their feet, unaffected by the weather. And they stared down at him as he scrambled in the dirt. 

He woke up. It was the dead of night. A fire crackled in the corner of the room. Descartes was inexplicably terrified. For hours he lay in bed and there in the darkness, half-mad with anxiety, he started to develop a terrible thought: what if there was an evil demon watching him, putting these nightmares in his head? 

He prayed. And then, finally, he fell asleep again. 

As soon as he lost consciousness there was a loud explosion. He snapped back awake and stared at the fire. Had it crackled loudly? Or did that just happen in his mind? He felt more terror, more of the anxiety of the night-time, and then eventually drifted off again.

He was standing by a table with two books on it. He opened one of them and saw the line: 'Quod vitae sectabor iter?' – what path in life shall I follow? A man appeared and they discussed the books for a while. Then the books and the man faded. 

But Descartes did not wake up. He stood there, by the table, and realised something. He was dreaming. And then he started to interpret the dream, to think it through, while he was still in it. When the analysis ended, he woke up. 

These dreams would come to define Descartes' life. He became concerned with the gap between dream and reality, the thin line between being awake – existing in a real physical space with ordered thoughts – and the crazed world of dreaming, where everything is bizarre and volatile. 

The aspect of dreams which seems to have disturbed Descartes was how life-like they felt. If dreams seemed so real at the time, he thought, then who was to say that the things we thought or perceived when we were awake were any more reliable? For all he knew, the evil demon he imagined that night was real. It could be putting thoughts into his mind when he was awake as easily as it could while he was asleep. 

Descartes didn't believe there was an evil demon. What concerned him was that he could not prove – utterly, without any trace of doubt – that there wasn't. And if he couldn't prove that, then he couldn't really prove anything. Perhaps green was red. Perhaps two plus two equalled five. Perhaps the bed he slept in wasn't real. If you followed this line of reasoning far enough, the world fell down: maths, geometry, physics, politics, religion, civilisation. Everything was built on shaky foundations. 

Descartes, an aimless 23-year-old Frenchman, decided to dedicate his life to finding certainty. He roamed the world, speaking with scientists and theologians, trying to find bits of knowledge, priceless slivers of certainty, which he could be absolutely sure were true. He was engaged in an act of existential quarantine: finding and isolating facts that someone could believe without any shadow of doubt. 

'During the following nine years I did nothing other than wander around the world trying to be a spectator rather than an actor in the dramas that unfold there,' he wrote. 'I rooted out of my mind all the errors that could have slipped into it.' Then, eventually, he settled down and started to write philosophy.