I think it comes down to scars.
Everyone has scars, both emotional and physical. Scars have this funny habit of fading, which is fine and dandy when they're physical (unless, like me, you think scars are kind of cool). I have a scar on my left knee that I got when I was twelve. I crashed my scooter and landed on my face, having to get stitches in my chin (that scar is gone now). I left with a scar on my knee, a little bigger than a nickle. It was pink and weird looking, and when the weather got cold, it turned purple. Now, eight years later, its faded to about the size of a penny and is no longer pink, but a shade just paler than my fair skin. If I didn't point out the slight discoloration, you wouldn't even notice it. It looks like just a part of my skin.
Like physical scars, emotional scars can fade as well, changing to look like who we are, when they were never meant to be there. They can be caused by anything. A falsehood you came to believe about yourself as a child, a poor relationship with a family member or friend, a bad breakup, or any other form of heartbreak. These wounds, like any wound, will scar if they don't heal properly. Like any scar, emotional scars may fade to look like you, but they don't work like you, at least, not how you worked before you were hurt.
Emotional scars do the same thing. They block the connection between mind and spirit, but usually we don't notice this block. It's not until we hear or experience something that resonates with us in such a way that we feel the block. We notice that we don't feel the connection while our head is accepting the logic. We understand and agree with what the preacher/teacher/author/artist is saying, but we still have trouble really seeing God in this new understanding, because the scar acts as a dam that blocks the river's flow, a wall that blocks our line of sight, a chain that holds us back.