This is one of my new philosophies in life.
I will not accept something just because I am told I should.
I will take nothing at face value.
I will not expect myself to agree with every opinion from a certain source just because I agree with some of it.
Now of course I will still trust people (until given a reason not to), but there is very little from human sources that shouldn't be questioned.
As far as I'm concerned if something is true it can handle a question. If I am sold on something and believe it fully then I am not threatened when someone questioned or disagrees with it - that gives me the opportunity to better understand, refine and learn to express my position.
So I read, I question, I ask, I try to see things from opposing points of view. I've always done this to one degree or another, but I want to be more purposeful with it - no sacred cows, nothing off limits. If it's true then it can handle the question...if it's not then why would I want to believe it anyway.