Those three words are very different concepts, but our culture likes to connect them. I love this article on how this relationship was established and the inherent problems with making them be related. It's worth five minutes of your time. Really.
The interesting thing to me is that while this relationship model hasn't turned out to be especially useful for business (where it originated), it is profoundly valuable for spiritual exchanges. Why?
It's useful because something goes on that we can't explain with words, nor understand in our Earth - 3 Dimension - Body paradigm. Practitioners feel this when they get information outside of the five senses. They interact with spirit or energy in a way that might not have any inherent meaning to the practitioner, but these interactions impart information that has VOLUMES of meaning, symbolism, and connection to the client. So information becomes instantaneous knowledge and many times, wisdom, sometimes for both practitioner and client.
It is not a linear process nor is it a purely intellectual process.
In our current society, information inundates us. Social media prompts us to give our opinions on everything. There is much more difficulty in discerning if someone is giving an opinion based on knowledge than the days when most of our conversations were local, singular, or in person. We've learned to accept position, degrees, certifications, and years of experience, as proof that a practitioner has knowledge if not wisdom.
But something unusual is happening. Many of us - those who are called to explore spirituality, healing, and connection - are finding ways of being of service that don't fit into the currently accepted validation constructs. There isn't a degree for what I do. I just learned more about something I do naturally and found that it has some value.
I don't think building a construct for practitioners will be the answer either. The very nature of the work REQUIRES that the client be personally discerning. We are being led back to trusting our instinct, to being responsible for ourselves.
My opinion on why we are going through a distrust phase - examples being the media and leadership - is that we are being pointed back towards ourselves. The pendulum needs to swing back to personal responsibility, and spiritual seeking provides those opportunities regularly.
So gather information on a practitioner you are interested in working with, but also trust your instinct. Discernment gives you a better opportunity to acquire knowledge and wisdom.