People
Wit ought to be a glorious treat, like caviar. Never spread it about like marmalade.
— Noel Coward

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker compares wit with a special delicacy, then warns against spreading it as freely as marmalade. The food contrast makes restraint part of the pleasure. Cleverness is presented as something to savour in select moments, rather than apply to every occasion.
Context reviewed