People
If we will only allow that, as we progress, we remain unsure, we will leave opportunities for alternatives. We will not become enthusiastic for the fact, the knowledge, the absolute truth of the day, but remain always uncertain.
— Richard Feynman

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
Feynman argues for staying a little unsure as we learn. Doubt keeps room open for alternatives, so today's accepted truth doesn't harden into dogma. Being enthusiastic about certainty is the trap he warns against here.
Context reviewed