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The word *right* is *exousian* - power to act, authority.
(a) power, authority, weight, especially: moral authority, influence, (b) in a quasi-personal sense, derived from later Judaism, of a spiritual power, and hence of an earthly power.
1849 eksousía (from 1537 /ek, out from, which intensifies 1510 /eimí, to be, being as a right or privilege) authority, conferred power; delegated empowerment (authorization), operating in a designated jurisdiction.
In the NT, 1849 /eksousía (delegated power) refers to the authority God gives to His saints authorizing them to act to the extent they are guided by faith (His revealed word).
http://concordances.org/greek/1849.htm *********************************************************************
And if two people claim to be saints,” to have the power to interpret but offer differing interpretations of the same text? Then who decides between them?