ITALIAN PROVERB / FAITH

I don’t mean to step on toes or ruffle feathers of any “true believers”; I’m merely writing a simple observation based on a proverb I recently translated.
“La fede sta nel credere, e non nel vedere.” Literally, this means: “faith rests in the believing, not in the seeing.”
If you want to sound more lyrical, you might say: “Faith is the vision of the heart.”
That sounds lovely, but let’s pull our heads out of the clouds and get real. When you buy a car, do you have faith in the salesman when he says, “it runs like a dream”? Or do you take it out for a spin to see for yourself? If the salesman has an oversized crucifix dangling from his neck, are his words more credible?
If you can’t see it, hear it, touch it, taste it, or smell it, do you believe whatever you’re told because your heart just had a vision?
I probed deeply into the meaning of this proverb and this what I concluded, “Faith is believing what you know isn’t so.”
This is the true meaning of the proverb.
Believe me.