When someone (usually speaking
for or about a religion) claims
that their beliefs are the one and only truth. While
they may not directly impress their beliefs on others, they speak
of their beliefs as if it is not possible that the literally thousands of other belief structures out there
could be a correct one.
"The only truth in this world
is that Christ is the one true savior"
"Hey man, no one knows which religion is right or wrong in the end, not even you, so quit truth hoarding"