From a great essay at Segullah:
Input always travels the path of least resistance. So the second time we see the new image, it will travel the same route. And before long, the new neural pathway has been stimulated enough to “desire” of itself continued activation. A habit is born.
After that, when the brain is not currently occupied, we long for that image. That is why we constantly check our phones or email. That is why, when we have a free moment, we click onto a favorite blog, check facebook, and tweets, or any other source of input we frequent. Without realizing it, we have begun to crave these places of input, hunger for them, to the point where they can surreptitiously dominate our time.
Tina said the only way to counterbalance this is with ancient and modern scripture. We must expose our brains repeatedly to the image or sound of God’s words. Printed, glowing on the page, read aloud, or discussed with friends. That is where God’s Spirit lives. It is where His mind and will can rise out of the texts we read or the conversations we share, and filter into our lives, allowing revelation to move through us.
And the money quote: “The battle today, between Babylon and Zion, is being waged between the synapses of our brains.”