Authority comes from the Latin auctor, which means originator, promoter.
When you are the authority on a subject - you are the originator of new ideas. The promoter of those ideas.
It gives me great joy to find authority figures like this, and go where they want to take me. The ones that lead by being original.
The authorities, the-having-the-authority-to, the authoritative figures in our lives: They, are not them.
They are not original.