I have noticed that a person's strongest desire, consciously and unconsciously dictates most of what they do.
So as for myself, I am more concerned with centering on that particular desire I mentioned as opposed to solely relying on my personal judgement.
Having said that, I don't think it's possible to be completely harmless as a human being. Even when we're walking on the street or in the park enjoying nature, we're potentially harming the insect life that we don't even notice. So I think it is mostly about being less harmful as opposed to achieving a state of perfection where not a single person or thing is harmed through our actions, thoughts or words.
RE: One Yeti's Perspective #281: Loving God For..When?