Juan es filosofo

Juan es un filosofo.

In the first, John is a philosopher by profession; we are just identifying him as a member of a class by giving him that label.

In the second, he is just being philosophical; this is not a standard label for John but is something exceptional.

Compare: Juan es atleta / Juan es un atleta importante

In the first, he is a professional athlete but in the second, while athletes are a class, "important athlete" individualizes John.

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