I learned that you can talk very naturally only to a few people. ............

I learned that you can talk very naturally only to a few people. 

That not everyone would understand what you tell them; 

not for lack of perspicacity 

but for a simple and real lack of interest. 

I learned that many will pretend to listen merely 

nodding their heads together with eyes unfocused. 

And then, 

only then, 

you will understand how important it is to choose sparingly 

those rare people who open their hearts.