Philosophy
The Epistemology of Evidence and the Evidentialist Thesis
Quick fact
Evidentialism, famously defended by W.K. Clifford, holds that 'it is wrong always, everywhere, and for anyone, to believe anything upon insufficient evidence'—making evidence the sole determinant of justified belief, with no room for wishful thinking or faith.
Why this is interesting
You probably think you should believe things only when you have good reason—but what counts as a 'good reason'? The evidentialist thesis says only one thing matters: the evidence.