[Satan] has always hated the truth, because there is no truth in him. When he lies, it is consistent with his character; for he is a liar and the father of lies. [John 8:31-58]
There are three areas in which the person who would be wise and good must be trained. The first has to do with desires and aversions- that a person may never miss the mark in desires nor fall into what repels them. The second has to do with impulses to act and not to act- and more broadly, with duty- that a person may act deliberately for good reasons and not carelessly. The third has to do with freedom from deception and composure and the whole area of judgment, the assent our mind gives to its perceptions. Of these areas, the chief and most urgent is the first which has to do with passions, for strong emotions arise only when we fail in our desires and aversions.
Ryan Holiday, The 366 Meditations on Wisdom, Perseverance, and the Art of Living
Zeno would also say that nothing is more hostile to a firm grasp on knowledge than self-deception. ~Diogenes Laertius, Lives of the Eminent Philosophers, 7.23
When we start deceiving ourselves into thinking not that we want something... but that it is a moral imperative that we have it, that is when we join the fashionable madmen.
3 Now the serpent was more crafty than any of the wild animals the Lord God had made. He said to the woman, “Did God really say, ‘You must not eat from any tree in the garden’?”
2 The woman said to the serpent, “We may eat fruit from the trees in the garden,3 but God did say, ‘You must not eat fruit from the tree that is in the middle of the garden, and you must not touch it, or you will die.’”
God has sure handed your enemy over to you this time! Abishai whispered to David. Let me in him to the ground with one thrust of the spear; I won't need to strike twice.[1 Samuel 26:1-12]
3 in whom are hidden all the treasures of wisdom and knowledge.4 I tell you this so that no one may deceive you by fine-sounding arguments.5 For though I am absent from you in body, I am present with you in spirit and delight to see how disciplined you are and how firm your faith in Christ is.
