I came across this sentence somewhere and could you tell me which one is correct?
It takes a lot from within to stand for who we really are.
It takes a lot from within to stand up for who we really are.
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To clarify, we're really comparing "stand" vs "stand up", since both of your sentences have a for before "who we really are".
There is a very subtle difference in terms of emphasis. "Stand up" emphasizes the beginning of whatever action (speaking up, protesting, petitions, etc) we're trying to symbolize by the word "stand". This is because we can change from not standing to standing by going up. On the other hand, "stand" emphasizes the duration / continuation of this action.
For your sentences, I would understand the first one to be used as a motivational quote for anyone that's looking for reason to continue standing for who they really are. The second one sounds like motivation to start standing for who they really are. But at the end of the day, I would expect both to get across the same message, and I don't expect a person to not keep standing / not stand up simply because one of these sentences was used instead of the other.