Well he says his name is "nobody" which when the other giants come and ask who did this in return he says "nobody" which gives Odysseus the perfect escape plan.
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It's more important to what a person does because as they say, actions speak louder than words do. A person can think a certain way but not act on it but what a person does reflects what they decide internally and what they wanted to do with that idea externally showing that they are serious with that idea of theirs in their head.