The message was proclaimed around the world every day at mass throughout the world to the faithful in the pews that couldn’t read. Even today, if you attend daily and Sunday mass every day for three years, you will hear read, virtually the entire canon of scripture.
Everybody conveniently forgets that literacy is a fairly recent achievement, and it is not yet universal.
And since no ones memory is that good, and most people don't go to daily Mass, it would behoove people to buy a bible to take home and read and study for themselves...