Benefits of Life Advice?

In discussing Huck Finn during class, we talked about the life advice that Huck gives and receives throughout the novel. He seems to take in the opinions and views of everyone else, while never actually processing it or thinking for himself. From an outsider's perspective, this is pretty easily recognizable. However, I thought about it a little more and realized that this directly applies to my own life.
       There are little "helpful quotes" everywhere, all telling me how to live my life correctly. They cover the Trevian Tracker (the little school assignment notebook) and they plaster the walls of the hallway. When I was in sixth grade I read the "A journey of a thousand miles begins with a single step" quote by Confucius. Not gonna lie, it got pretty old after the first fifty times.
       Personally, I think that getting life advice crammed into your ears is not helpful at all. In fact, it is actually harmful to a person's morality. If an institution wants to impress students with some sort of life lesson, they have to find a more effective way of doing so. 
      The reason why sayings like this are not a good idea is the same reason why we try to discover knowledge rather than receive it in class. If one is simply told something, the message often does not stick. But, it they truly learn it for themselves, it will be ingrained in their minds for a lifetime.
      It is wrong to shove quotes like this at young children and to tell them that they have to live by them to have a successful and moral life. It is not true and it is far oversimplifying ethics. If we cannot honestly trust kids to discover their own moral fibers, then out society is pretty far gone. I believe that ethics should be discussed and discovered, but never wraped up neatly in cute little wall posters. Thoughts?