People
In philosophical discussion, the merest hint of dogmatic certainty as to finality of statement is an exhibition of folly.
— Alfred North Whitehead

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
A caution about certainty in philosophy. Even hinting that a statement is final and beyond question, the speaker says, displays foolishness. Serious thinking, on this view, stays open to revision, so dogmatic confidence is the surest sign someone isn't reasoning well.
Context reviewed