“is it better to not do something cause your a good prson, or cause hashem said so. killing for example”
I take “not do something cause your a good prson” as the other (human) party’s interests being an END in the decision. The question being when being Mekayem a B”O lachaveiro Mitzvah, should the other person or Hashem be the end of your decision.
After thought, this great question is fundamentally flawed: G-d is not only plain “the Creator,” but the Ultimate Good. Thus, you cannot separate the two sides of the question, and doing the mitzvah for Hashem’s sake, is doing it for morality’s sake and for the Mitzvah’s sake at once.
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