Can't/cain't

I was wondering the meaning and origin of "Can't died in a cornfield". My mother used to tell me this whenever I said I can't do it.....

Re meaning, I'd assume something along the lines of "if you don't at least try, you'll always be bound to fail". As to origin, and this is a freely admitted stretch, I wonder if it's biblical? My scriptural knowledge is rusty, but didn't Cain the crop-minder kill Abel the herdsman in a cornfield? I therefore wonder if it's a far-fetched pun, with the "can't" being a sound-alike for the opposite of "can" and therefore meaning Abel. It almost sounds plausible in some seriously skewed way... is "can't" pronounced "cain't" in some States?

Yes, in the southern U.S.

Where did Kant die? Just wondering if the answer would have any bearing on the issue.