"We see things not as they are, but as we are."
--H.M Tomlinson
We often deal with new ideas, with changing how things are done, with trying to persuade others about our point of view. The longer you've lived, the more you realize the number of obstacles to people automatically accepting and absorbing your information.
Maybe the greatest single stumbling block to real communication is the one-sided nature of speaking.
I know that you already know about this: intellectually. But let's face it: Most of us concentrate on what to say and how to say it. In our zeal to get our message across we forget that at the other end of our message is a real, live person with her own zeal, goals, and concerns. These may not coincide with ours, especially at the moment when we are about to start communicating our new ideas.