I honestly never thought I’d be living out one of the classic thought-experiments from a philosophy tutorial. But that’s what happened.
I was picking my wife up from hospital where she had had some tests. As I drove into the hospital complex, she called me to say the receptionist had informed her I had arrived and she’d meet me at the exit. But how did they know I was there? Especially when, at the time the message was delivered, I wasn’t. Presumably some other patient’s partner had arrived and the receptionist told the wrong person. But did they know I was there? As a former student of epistemology – the philosophy of knowledge – this demanded further thought. (Yes I know, I know, but bear with me.)
Justified true belief is a definition of knowledge, often credited to Plato and his dialogues. The concept states that in order to know that a proposition is true, we must not only believe the relevant true proposition, but also have justification for doing so.