MacBeth- actions

Is human nature determined by “what you do” or what you are”? I think human nature is determined by what you do. I think this because your actions say a lot about who you are. It doesn’t matter if you don’t like something you did or wish you hadn’t done it, it is still done and you can’t go back. Due to this I think your actions determine who you are as a person. Like in Macbeth, Macbeth didn’t think of killing the king before, but due to how the story came about, he was put in a position to kill the king. And even though this was not like him before, it is part of this now and it is determining future actions of his. This is because due to him killing the king, he had to change his ways, he had to become a killer. He had to kept killing and lying to hide what he had done. So even though killing was not who he was, it had become who he now was. So I think that what you do determines who you are at the moment, the things you do can always change who you are. That is like with friends, sometimes they do things that change who they are. They do things that make you and others see the new them or who they have become. Actions change people and they also define people, it makes you and them notice who they really are because actions lead to other actions and to changing others.