protocol...

usually, there is some communication protocol between two...

let's say one of them stick to the protocol and the other doesn't. 

then the former one is the one who gets hurt all the time... because he/she is too thoughtful and cares too much... 

and the latter one seems always happy... because he/she is ignorant... and rude... there is nothing for him/her to care about...

yes... st. paul is right. the world is not fair... it is really not...