I am writing my novel in first-person. The style I have adapted is that my main character will do actions in past tense, and also delve into his thoughts. Perhaps, my main character will think of a certain subject or idea, and go into commentary on it. What I am wondering is... is it okay for the actions and story itself to be in past tense... but when my character goes off into commentary on a subject related to the actions in the story (let's say commentary on religion or politics or something) is it okay to switch to present tense? Then move back to past tense in the next paragraph when the action/story continues? To me, having the character's/narrator's commentary on a present day subject, but writing it in past tense... just comes off awkward to me when I read it, like it's in the past and not current/still is, even though it is, if I am making any sense. I could write up an example or something if I'm not making sense.