James believed that the single most informative thing you could know about a person was his or her:

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James believed that a person's worldview or their beliefs, values, and perspectives about the world around them, was the single most informative thing about them. This encompasses their early experiences, cultural environment, and even genetic makeup to some extent, as it shapes the way they perceive and interact with the world.

James Believed That the Single Most Informative Thing You Could