According to Osho, it’s a humorous exaggeration: Marwaris are so shrewd that even the devil can’t deceive them. He illustrates this with a Nasruddin tale where the would‑be trickster is outsmarted and loses his money. Osho’s point isn’t ethnography but insight: alertness, bargaining savvy, and priority for gain can flip deception back on the deceiver.
Osho jokes that some people are so sharp that any trick aimed at them ends up trapping the trickster instead.