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### Austinstar says

The theory of gravity has mostly been proven through logic. Until very recently, gravity "waves" were not measurable. (Light waves have been measured successfully however, as an example).

Logic indicated how gravity behaved, but it was unprovable until mathematicians could calculate the effects of gravity by observing how two objects related to each other. Then, as stated, a gravity 'particle' may have been discovered recently.

So, yes, some things can be 99% proven by logic. However, it is much easier to prove when a measuring stick can be applied.

Yep I always have my stick with me.

### Snøwman says

You can't have logic without evidence. Proving something true without evidence is illogical. Can you give an example of logic without evidence?

Me personally, no. But when I talk with theists and they talk about proof, they start trying to prove it through logic rather than evidence all the time.

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### Kathleen Odenthal Romano says

Logic is not an antonym of evidence. In fact they are closer to synonyms.

I completely agree, which is partially why I wonder why it is used so much when trying to prove a concept so potentially important such as a god.