>>wondering if and why speaking is linked to PREDICT

Speaking is intrinsically tied to prediction because of the connection between words and prophecy. Predictions are not visions. Visions asserted verbally is what a prediction is. Chanting, intoning and reciting are the most common forms of prediction.

"An' I'm learnin' 'ere in London what the ten-year soldier tells; If you've 'eard the East a-callin', you won't never 'eed naught else. No! you won't 'eed nothin' else"