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The misconception that knowledge needs authority to be genuine or reliable dates back to antiquity, and it still prevails. To this day, most courses in the philosophy of knowledge teach that knowledge is some form of justified, true belief, where ‘justified’ means designated as true (or at least ‘probable’) by reference to some authoritative source or touchstone of knowledge.

— David Deutsch The Beginning of Infinity (2011)

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More quotes by David Deutsch

Let me define that [wealth] in a non-parochial way as the repertoire of physical transformations that they would be capable of causing.

The Beginning of Infinity (2011)

If something is permitted by the laws of physics, then the only thing that can prevent it from being technologically possible is not knowing how.

The Beginning of Infinity (2011)

Genes embody knowledge about their niches. Everything of fundamental significance about the phenomenon of life depends on this property, and not on replication per se.

The Fabric of Reality (1997)

Could it be that the moral imperative not to destroy the means of correcting mistakes is the only moral imperative? That all other moral truths follow from it?

The Beginning of Infinity (2011)

Since building a universal virtual-reality generator is physically possible, it must actually be built in some universes.

The Fabric of Reality (1997)

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Quote text and notes from Wikiquote: David Deutsch (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.