Here is a spiritual exercise.

If you think about someone’s negative traits, you will have negative feelings about them.
If you think about someone’s positive traits, you will have positive feelings about them.
If you can mange to think about someone’s strength and flaws both, if you can somehow hold them in your mind entire, you will have spiritual feelings about them.

It works. If you can really have a vivid conception of someone’s power and glory and pettiness, you will feel like the top of your head has come off.