Well this is an interesting subject. I think that it requires a rather rare bit of knowledge to plumb properly though. Do you know
this story. It indicates the phenomenon of projection. Hemans seem generally unaware that they are constantly projecting, interpreting the world according to feelings the projector is unconscious of having. An adgry person thinks people are angry. A lear thinks people are lying. A thief always has his eye on his wallet suspecting it will be taken. An idiot sees lots of idiots, etc.
Now most people are interestedin their reputation and struggle mightily to keep people's projections of them from taking hold and projectors are constantly trying to tar this or that person with their projection.
But if you are truly interested in truth about the best you can hope for is to help people see how blind their projecting makes them by showing them what they are doing. It's a thankless kind of task because they immediately suspect you of whatever it is they are hiding about themselves from themselves. Anybody, therefore, who wishes to teach must expect to be the Devil.
We are actually all mirrors of each other. We are all three things, what we think we are, what others think we are, and what we really are. What we think we are is a flattering ego construct, what others think we are is what they are, and what we really are, well ....
So since you are only going to be a mirror in which others see themselves, you might as well take conscious control over it.
In it what is in it. You get what you pay for. I'll see it when I believe it. These are bits of wisdom that all refer to the fact that we can only see is limited by a certain kind of insight I'd call self knowledge.
The person who knows himself doesn't judge. He doesn't have to. He knows.
Oh my Beloved, wherever I look, it appears to be Thou.