Rick O'Shez
Irishman bouncing off walls
First experience then belief so it is both.
Though I think it's quite tricky to disentangle these and to be clear about which comes first. We often try to fit our experience into an underlying belief system, which leads to confirmation bias and so on.
Or some people develop a personal theory, invest in it heavily, and then try to "prove" it any way they can.
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