Imagine a high priest of a defunct sect of an obscure god. He spends most of his preaching time on a box atop a hill, but believes he is on a mountain.
He denounces the priests of newer orders, although they spread the good news about the same god. These priests have managed to gain a small number of converts in their chapels, and speak of visions of mass congregations.
The crazy old priest can cast all levels of clerical spells, but they only effect things within a three foot radius of his soapbox. Since the clerics of other sects are all lower levels, he feels free to cast curses upon them whenever he feels them out of line. The effects of these curse spells never reaches any of the targets, and most people passing by would rightly take him for a fool.
The irony is he is still welcome in the chapels, despite everything.