Humans are dualistic by nature. We are both of spirit/source energy and ego persona/matter. When we are about 3 years old we start developing our sense of self/individually primarily by labeling and judging our perception of what is appearing. If we never learn to temper this as we grow older we become more separate from our own spirit as well as others. Which leads to feeling loneliness, isolation and even abandonment. We have ultimately abandoned our spiritual self through constant separation.
Let's look at this from another angle, instead of labels such as bad/dark we use the term low frequency, and substitute high frequency for good/light. Now we are working in a range. Each person hold an energy frequency on that range (humanity). Energetic signatures are the total of our thoughts, feelings and beliefs. We are all unique, and have a base setting when we are born, a natural operating range/frequency which is then tuned through our energetic signature.
Why? Each of us is here to experience, learn and grow through the vessel of humanity. Humans are dualistic, for each frequency there is another frequency holding its opposite, low and high for example. Our base setting is determined by the life lessons we are here to experience.
Does that mean people can't change? We can always respond to life from our higher selves rather than react from our ego persona. It takes awareness and conscious observation. It's a practice which requires dedication. It can be done.
Where do spiritual teachers fit in? When we are shifting up on that energetic range it is helpful to someone higher on the scale hold space, and support us through the transition. Their presence helps adjust our vibration and frequency. Do all teachers shift you up? No, they don't, we must use discernment when choosing a teacher. Remember we are all operating on a range. Look for people whose words and actions have congruency. Whose presence feels uplifting without them speaking.
Since there is no bad or good when we drop the labels, how does that change our perception of reality? Let's use an example: on our way home we get mugged, now our lower frequency will react, the perpetrator becomes evil and we become a victim (energetically). Our energy stays in that frequency, law of attraction!!!!!! We will continue to receive validation for our frequency, more experiences that support victim-hood plus we are still stewing in the event. We keep replaying it in our heads creating more and more..... suffering.
A different experience is in acceptance. We got mugged on the way home, OK we proceed by contacting the police, credit card company .... whatever we need to do. Accepting that the perpetrator was acting from his lower energy frequency, we don't react or go into victim-hood, it is what it is, let's keep flowing into the next moment. We don't create resistance of what has appeared by telling a story about poor us or evil him... which would shift our energy frequency and cause suffering. Resistance = Suffering.
It does boil down to, we are all here to do and experience what we are meant to. What we need in order to evolve and shift into the next frequency. Sometimes it's our own suffering that is the catalyst for transition. It's the sign that alerts us to change our perception, and balance our spierits and ego personas. Being human is challenging, if we can observe ourselves, detach from ego once in a while and rather than label others, hold compassion, we will create harmony and that.... feels good/different.