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Appeal to confidence

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Cogito ergo sum
Logic and rhetoric
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An appeal to confidence occurs when somebody's confidence in some fact is taken as proof of that fact. On the other hand, an appeal to unconfidence (also ad fidentia, against self-confidence) occurs when somebody's lack of confidence in some fact is taken as disproof of that fact. Either appeal ties confidence to authority and ties authority to truth.

It is an appeal to authority (or lack of authority), an informal fallacy, and a fallacious argument.

If the arguer additionally states something along the lines of "doesn't his confidence just lift your spirits?" or the inverse, it also qualifies as an emotional appeal.


Appeal to confidence:

P1: A says Q.
P2: A says: "Trust me — I know what I'm doing!"
C: Q is true!

Appeal to unconfidence:

P1: A says Q.
P2: A's shaking in their boots!
C: Q is false!

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See also[edit]