"Your brain is wired for story, and every time you tell it one it rewards you to help create and strengthen neural pathways. The scary part is that it doesn't distinguish between rewarding lies or irrational or unfounded beliefs and the truth. So tell yourself good stories before your brain settles for any garbage story it can make up in a given situation.
God speaks to us in stories. There is a creation story, and a crucifixion story, and a consummation story. In short, Jesus has a story and we're in it. The enemy's job is to distort that story and our role- and God's. Each time we hear a story our brain rewards us for it, whether it's God's truth or the enemy's lies.
When Spurgeon said, 'discernment is not the difference between right and wrong, but between right, and almost right,' it aligned with the Word telling us our enemy disguises himself as an angel of light. This means Satan will come to us deceptively to make us believe his story is the truth. The reality is that all he has to do is present his lie, and if we're not vigilant, if we're not actively telling ourselves the truth of God's Word and the truth of His story, our brains will reward us for the lies the enemy presents. Eventually we won't know the difference between true light and its deceptive counterfeit."