"In his pride the wicked does not seek him; in all his thoughts there is no room for God." (Psalm 10:4 NIV)
The number one evil in God's black book is pride. It is important to note that pride can be interpreted in two ways: personal gratification for a job well done, or the dreadful deadly sin of "the competitive and excessive belief in one's own abilities that interferes with the individual's recognition of the grace of God."
God's opinion in Proverbs 8:13 makes clear that He severely frowns on pride. "The fear of the Lord is to hate evil; Pride and arrogance and the evil way and the perverse mouth I hate." It was the very thing that rocked the heavenly realm long ago, altering God's original plans and introducing to mankind a surefire way to hell.
The sin of Lucifer is clearly spelled out in two sections of scripture: Isaiah chapter 14 and Ezekiel chapter 28. Referring to Lucifer's mutiny, it is written: "For you have said in your heart: I will ascend into heaven, I will exalt my throne above the stars of God; I will also sit on the mount of the congregation on the farthest sides of the north; I will ascend above the heights of the clouds, I will be like the Most High. Your heart was lifted up because of your beauty; you corrupted your wisdom for the sake of your splendor." And nothing has been quite right since.
Regarding pride, early Italian Catholic Priest Thomas Aquinas wrote that inordinate self-love is the cause of every sin. This was initially epitomized by Lucifer, and he has employed it successfully on humanity for thousands of years, steering people away from the one true and holy God. As Proverbs 10:4 teaches, the one influenced by the adversary has a false sense of complete self-sufficiency, and therefore he will not seek God, His will, His way or His wisdom, believing erroneously there is no need for God - in all his thoughts there is no room for God.
A notorious example of pride is Jezebel, the evil queen and wife of Ahab, the abominable king of Israel in the peak years of its deterioration. Daughter of a High Priest of Baal, Jezebel re-instated Baal worship in Israel and led her husband by the nose to do the same. She had many of God's prophets executed and replaced them with hundreds of false prophets, surrounding the king and herself with devilish counsel.
Jezebel had an innocent man murdered to acquire a vineyard for Ahab. She threatened the life of God's prophet, Elijah, and her name is mentioned in the book of Revelation representing a false prophetess seducing and misleading God's people into evil. Jezebel's demise was horrific. She literally became dog food.
Proverbs states that when pride comes in, so does shame and strife. But perhaps the most quoted (and misquoted) verse regarding pride is found in chapter 16, verse 18: "Pride goes before destruction, and a haughty spirit before a fall." God cannot get through to the proud person, but requires humility, surrender and submission, which prepares a person to receive from Him the buffet of blessings He desires to bountifully bestow.