So I’m not a member of any of these religions, but on the topic of doing no harm, I learned that in Hindu Dharma, Buddhism and Jainism, there is a concept known as “not harming,” Ahimsa. It’s known as (one of) the greatest vow(s) and is the hardest vow to achieve. And Ahimsa applies to not just your actions but also what you say and what you think. I guess this is what Lena is trying to achieve, but it’s the hardest vow for a reason
Y'all are asking really good questions that I can't answer. Pretty sure there are college professor out there spending their careers trying to answer these questions. The meaning of "do no harm" is varied and nuanced outside of its use in the Hippocratic Oath, and I dunno what to tell you except that it seems they wasted Ahimsa as an episode title last season, lol.