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@Salixes
Try to follow along. I made the following statement:
"If you choose a different source, you get a different result"
and you said, in response,
But I didn't.
Your statement was, therefore that you didn't choose a different source. Different from what? You chose one that was the same as what? You chose one source, and I chose a different one.
I quoted an authoritative, definitive and irrefutable source.
You cut and pasted from a google search that presented a number of different definitions, and you snipped the one you wanted. If that one you chose was, indeed, "definitive" then not only would your source have provided no others, but there would be no other dictionaries in the world, or theological understandings that gave different definitions (such as https://www.macmillandictionary.com/us/dictionary/american/prayer ).
But even in YOUR OWN provided definition, the word is defined as a "...solemn request for help or expression of thanks".
So ignoring the existence of other definitions, you just provided one which counters your own claim that prayer is always petitionary.
Still unproven and unprovable.