I had a grandmother (my mother's mother) who was what we call a "character" - sort of an odd or funny person but in a good way. When we would eat with her or she with us, she would say the prayer before the meal: "In the name of the Father and of the Son and of the Holy Ghost, whoever eats the fastest gets the most." She was also always stealing parking places from people, slipping in just as someone else was about to park their car. My mother would yell at her, but my grandmother would just say "That's what they got brakes for." She died when I was only ten, but I still miss her.
Anyway, I think you're right about sayings/proverbs and passing down oral wisdom. I suppose before the invention of the printing press, these sayings were one of the main ways of passing knowledge from one generation to the next, since most people couldn't read.
My grandmother had a saying, "A little knowledge is a dangerous thing." This was first said by Alexander Pope, I think some time in the 18th century. It's funny that I remember that after all these years, but it goes toward proving your point about proverbs and passing down oral wisdom.
On the subject of computers ... I think one of the great challenges of the "information age" is that now there is so much information that it is very difficult to sort out what's good from what's garbage. I would like to see into the future a few centuries and know how generations to come will deal with this.