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It's up to you I personally like to treat thoughts the same as spoken speech, since they are in a different "voice" from the narrator’s. For me, it’s not a question of what’s spoken out loud, but ...
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Source: https://writers.stackexchange.com/a/8855 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
**It's up to you** I personally like to treat thoughts the same as spoken speech, since they are in a different "voice" from the narrator’s. For me, it’s not a question of what’s spoken out loud, but a way of identify whose perspective is represented by those words. If there are no quotation marks the perspective is assumed to be the narrator’s, and that’s the wrong interpretation. You won’t be wrong, as long as you’re consistent and the writing isn't confusing. I prefer to avoid italics, since they have yet another pre-existing meaning, but it can be helpful if you find it necessary to distinguish strongly between spoken and thought words.