He obsessed about it ... he believed that it was true.

Propaganda, to be effective, must be believed. To be believed, it must be credible. To be credible, it must be true.

He said he believed in the golden rule,

Myths which are believed in tend to become true.

There but for the grace of God go [I].

Be of good comfort brother; for we shall have a merry supper with the Lord tonight!