“Unless you know the code, it has no meaning.”
“What is this? He has a sensation of touching glass. He doesn't know if they are talking about nothing or making code for the deepest meanings.”
“There is no way that you can know the taste of water unless you drink it or unless it has rained on you or unless you jump in the river.”
“Of course, a sign doesn't mean anything unless you know how to interpret it.”
“Knowing what's right doesn't mean much unless you do what's right.”
“You want to know the meaning of death. But how shall you find it unless you seek it in the heart of life?”