Internal compass
2.24: The Master said, "To sacrifice to spirits that are not one's own is to be presumptuous. To see what is right, but to fail to do it, is to be lacking in courage."
I believe we all have an internal compass that tells us whether something is right or wrong. That nagging voice at the back of our heads. Some people have a stronger internal compass than others. But it also depends on whether we have the courage to do the right thing (or not do the wrong thing).