A sinful outlook.

J.I. Packer has written:

“And this same outlook has been natural to man ever since. Sinners are no more ready to acknowledge God in their thinking, by allowing his utterances authority over their judgment, than they are to acknowledge God in their action, by allowing His utterances authority over their behavior. Sin has its root in the mind, and this attitude of mind is its very essence. And when men become Christians, they are still prone in their pride to lapse in the assumption that there is no rationality or wisdom in merely taking their Creator’s word; they are still apt to demand instead that their reason be permitted to make its own independent assessment of what He says and to have the last word in deciding whether it is credible or not. This is as real and gross a moral lapse as any, though it is not always seen as such; and the temptation to it is strong and insidious. And once one succumbs, and relapses to any degree in this sinful habit of mind, one is instantly drawn to the conclusion that Christians who continue to base their thinking on an unquestioning belief of what God has said are fettering reason and stifling free thought. No doubt the serpent would have gold Eve as much, had she asked him.”

(Packer, J.I. “Fundamentalism” and the Word of God, Eerdmans, 1972, p. 139.)