You should try Googling this. You find out that A.I. has been brainwashed to associate Developing Spiritual Authority with Abrahamic religions and gives no other options. Again it is likely milking Wiki for answers, and showing how Wiki is being controlled by Abrahamic religion.
You have to add 'in the occult' to your inquiry to get an answer suitable to what most people here are interested in.
Then the A.I. will say, "involves cultivating inner mastery, profound knowledge of esoteric traditions, and consistent ritual practice."
So, describe "inner mastery" or "profound knowledge of esoteric traditions" or "consistent ritual practices"....
LOL, we could go round and round with that.
My inner roommates think I'm an ass, and don't necessarily like me much. Yet they still show me things and allow me to participate. I have a pretty wide range of knowledge about many different esoteric traditions and practices. Not much of that has actually been helpful or explained the how of anything. I got more satisfaction by reading studies from Prof. Persinger and Bengston, D. Radin, and other folks looking at the real deal.
Being an authority usually entails being in charge of something, controlling things, steering the boat, making decisions, and HAVING ACTUAL POWERS you can control. Not much of that actually happens to many people involved in these studies.
I remember sitting in a Catholic Mass (no I'm not Catholic) with a friend, and the priest talking crap about the authority he has, which made me burst out laughing in the middle of that mass service. Like this guy has any actual spiritual authority or that it was given to him because he sticks around for his free housing and Mercedes. I would love to see him in an actual possession situation, getting chewed up and spit out by a real demon that has some horrible agenda... oh wait, that's just in the movies...
I was sitting there thinking about the Inquisition, and how the only reason this religion is still around is because they persecuted and murdered for 400 years. I guess that's one way of becoming an "authority". And I was thinking about all the goodies they have locked up in the vault below the vatican that they won't share with the world.
Anyone claiming to be an authority usually gets the brunt of my defiance disorder unless they have shown through actions that they are worthy of being an authority.
But, in my humble opinion, to be spiritually an authority you would need power, control, and the clarity. So energetic clarity. This is so rare that we likely only see it every few thousand years.