I would confront the "backstabbing" friend or ask around to investigate more before I can make a decision that my friend was indeed backstabbing me or not. I rarely jumped to the conclusion about anything. I learned the hard lesson when I was young kid and I promise to not do that again ever.
Naw. I tend to research... actually, LOT of researching before I decide if I should believe him or not.
I also used to think that Fluoride is good for our bodies & our health because government said so but my mother said it isn't. So I decided to investigate the informations and facts by different authors and researchers... because I found out that Sweden and other countries banned Fluoride from their water system. I finally came to the conclusion that it isn't good for our bodies and our health.
I hope it is ok for me to bring Bush up as example in this topic. He shared his opinion about Social Security and I decided to look into http://www.thereisnocrisis.com/ and many results & facts conducted by economy analysts in different articles included Time before I make a decision which I did. I found it isn't crisis at all.
Discernment DOES worth to have... no questions about it. I used it almost all of the time for any kind of situations. I am not allowed any persons or knowledges (books, magazines, journals included bible) to affect my judgment until I get the information from both sides then make a decision.
I made several mistakes in the past which I don't want to repeat in the present and future so I want to look at both side and make any decisions based on it.
Edit: Ah one thing... sometimes facts alone does not good enough.. If I didn't get enough information then I will use my 'guts', experiences and conscience to make a decision.
Second Edit: I can be very straightforward at some point, I have to do that so I can make a decision based on 'effect' -- Law of Causality.