7) This Holy Book Says it is True, so it must be Right!
Welcome to the land of Circular Reasoning!
Here's how it usually works: "My Religion is Right!" "Why?" "Because my Holy Book says it is!" "Well, why should I believe your Holy Book is Right?" "Because my Religion says it is!"
You can not logically say "Here's my first premise, here's my second premise. My first premise is true because my second premise says it is. My second premise is true because my first premise says it is. Therefore, both premises are true and support each other!"
Unfortunately, this doesn't work when exposed to any form of logic or rationality. In order to provide "proof" there must be validation from outside of the condition being tested.
8) Divinity Said It Was True, so it must be Right!
This is almost identical to the last technique, but instead of a Holy Book saying it, some form of Divinity said it.
But who did they say it to? Was it someone you know is trustworthy? Are they alive?
Did you hear it? So it's at best second-hand knowledge (you personally know the person who Divinity spoke to), or most likely third-hand (usually more like 100-handed) knowledge.
Have you ever played the game of "Telephone"? People line up, and a message is whispered to the first person in the line, who whispers it to the second person, who whispers it to the third, and so on until the last person gets the message. They then say the message that they got and everybody laughs at how the simple message got completely mangled to the point of being unrecognizable.
Now, add to this process the following and shake, not stir: What century was it written in? What language was it in? How many translations has it gone through since then? How likely is it that there were words and phrases that did not translate literally, and the translator had to make an approximation across the languages? How many cultural differences go unstated that are not accounted for in translations? How many political or other agendas were able to influence the translations to sound more like the positions that they advocated?
As you can see, there are many issues that can take what could have been straight from Divinity and changed, confused or corrupted it on its way to the version you see today.
And we still haven't addressed the issues as to whether the person who originally said they heard it wrote it down correctly. Have you ever tried to write down what happened in a dream after you woke up? Have you ever had difficulty expressing a significant personal experience using nothing but words?
And then there is the most basic question of if they actually did receive a message from Divinity or not. Could they have just made it up? Were they trying to impress someone, become famous, influence people? Under the influence of a mind-altering substance? Suffered from a mental illness?
Do you know people who you trust who have told you important things that turned out not to be true?
Unless you personally experienced it, you have no unquestionable basis to believe it. And all of the other rules here also apply to why you should believe what someone else says is true.