Neil at 4Simpsons says we should be careful what we feed our mind with.

I agree.  We should limit ourselves to spiritually and morally uplifting and edifying images and literature.

Watch Babylon Five,  Firefly, Buffy the Vampire Slayer, Angel, Battlestar Gallactica, Stargate SG-1...Fiction that shows us at our best, our worst, and our most in-between and doesn't let us idealize ourselves ourselves or avoid our flaws, but challenges us to reach for the ideal all the same.  Not because we fear punishment or crave reward from some distant, absentee father-figure in the sky , but because we owe it to ourselves and our humanity.

Read the about our history and where we came from so that people can't baffle you with bullshit.  Read original sources whenever you can, the real "no spin zone".

Read the Bible for real (as in, straight through, not a peice at a time in some "guided study").  Get the full picture and then decide if you want THAT to be the map of your world, and if so, how you think you should follow it.

Read science papers.  They're all over out there in the intertubes.  You don't have to rely on B.S. "science reporting" anymore.  Read the original papers.  Also, see if the people who did the study have a blog where they talk about the study, and find where other experts comment on the study.  You can go see for yourself what's what.

And go ahead and look at beautiful images of beautiful people.  It's not a freaking neuro-toxin as Neil would have you believe.  Filling your mind with images of human beauty does not cheapen it.  Doing stuff like putting a drape over Lady Justice so nobody sees her boobies, and then taking a crap on civil liberties every chance you get...THAT'S cheapening humanity. 

Don't listen to stuff that confuses those sorts of priorities, but you should probably expose yourself to it so you know what's going on.

And finally, remember what Jesus said:  It isn't what you take in that makes you rightous or sinful..but what you put out that does.  Read, watch, seek and think good...but also DO good as well, because without that, you're just wanking.