Why do thoughts feel so convincing?

"They're annoyed with me." "I've handled this badly." "I'm going to be found out." These arrive in your own voice, in your own head, with the same texture as "the kettle has boiled", and nothing about the experience distinguishes a well-founded conclusion from a tired guess.

Fluency is mistaken for truth

Thoughts that come easily feel more true than thoughts that come with effort. This is a well-documented bias and it has an unfortunate consequence: the things you have thought most often become the things that feel most obviously correct, regardless of how they got there. A belief rehearsed for fifteen years is extremely fluent.

Mood writes the shortlist

When you are low or anxious, matching memories become easier to retrieve and matching interpretations come to mind first. So the evidence available to you at that moment is genuinely biased, you are not reasoning badly, you are reasoning well over a selectively supplied sample.

The question is not "is this thought true?" so much as "is this thought the whole shortlist?"

A more useful move than arguing

Trying to dispute a thought head-on often strengthens it, partly because arguing requires holding it in mind. Frequently more useful is changing your relationship to it: noticing it as an event rather than a verdict. "I'm having the thought that I've handled this badly" is a meaningfully different sentence from "I've handled this badly", and the difference is not wordplay, it restores the gap between you and the content.

• Ask what else would also explain the evidence. Not what is nicer, what else fits.
• Ask whether you would reach this conclusion about a friend from the same facts.
• Ask how convincing this thought was last Tuesday at 3 PM after lunch. If the answer is "less", the variable may be your state.
• Ask what the thought is protecting you from. Many harsh thoughts are pre-emptive: if I criticise myself first, nobody can do it to me.