Imagination
Nothing is more free than the imagination of man. (Hume, 18th-century Scottish essayist)
Out of free thinking have come imaginative thoughts that have created much of what we experience today. However, it’s not all good. What God saw among his creation early on was that “every imagination of the thoughts of his heart was only evil continually” (Genesis 6:5). We see evidence of such thinking today, too. So, it’s critical to judge well and follow worthy ideas.
Cast down imaginations, and every high thing that exalts itself against the knowledge of God and bring into captivity every thought to the obedience of Christ (2 Corinthians 10:5 paraphrase).