1

According to that theory, knowledge does not require that the believer possess/possesses positive reason.

4

While the subject "believer" would take a third-person singular verb conjugation in the present indicative (possesses), this is a subjunctive construction, so it can take the infinitive form.

Not everyone uses the subjunctive in English. I would say "possess" here, but a lot of people might say "possesses."

So, in short, using "possesses" is certainly not required, but it also wouldn't necessarily be considered wrong.

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