One the earliest known origins for this familiar turn of phrase comes from, everyone's favorite Roman, Cicero. "Ut imago est animi voltus sic indices oculi," he was known to remark. Of course what the old boy was trying to say was, "The face is a picture of the mind as the eyes are its interpreter." He just insisted on speaking Latin for some strange reason. However, our team of crack scientists here at 5 Doors Up has discovered, that while well meaning, Cicero was mistaken and the actual window to the soul is.......(drum roll)......shoes. I know, we were surprised too. Permit me to demonstrate:
"Don't let me date your sister."
"Hello, I'm your new brother-in-law."
Game. Set. Match.