Read Self-Deception, by Tom Ascol, at Bible Study Tools.
"Have you ever noticed how many times and how many ways the Bible warns of being deceived? By clear admonition as well as by graphic example God repeatedly calls us to be on our guard against believing lies. That's what deception is--believing what is not true. It is one of the great works of the enemy of our souls. So the Lord repeatedly warns us about it in Scripture..."
And He said, "See to it that you are not misled; for many will come in My name, saying, 'I am He,' and, 'The time is near.' Do not go after them."
...for sin, taking an opportunity through the commandment, deceived me and through it killed me.
Or do you not know that the unrighteous will not inherit the kingdom of God? Do not be deceived; neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor homosexuals,
1 Corinthians 6:9
Do not be deceived: "Bad company corrupts good morals."
1 Corinthians 15:33
But I am afraid that, as the serpent deceived Eve by his craftiness, your minds will be led astray from the simplicity and purity of devotion to Christ.
2 Corinthians 11:3
Do not be deceived, God is not mocked; for whatever a man sows, this he will also reap.
But evil men and impostors will proceed from bad to worse, deceiving and being deceived.
2 Timothy 3:13
For we also once were foolish ourselves, disobedient, deceived, enslaved to various lusts and pleasures, spending our life in malice and envy, hateful, hating one another.
Do not be deceived, my beloved brethren.
...and will come out to deceive the nations which are in the four corners of the earth, Gog and Magog, to gather them together for the war; the number of them is like the sand of the seashore.
And the devil who deceived them was thrown into the lake of fire and brimstone, where the beast and the false prophet are also; and they will be tormented day and night forever and ever.
...and you will know the truth, and the truth will make you free.
Sanctify them in the truth; Your word is truth.
For we are not bold to class or compare ourselves with some of those who commend themselves; but when they measure themselves by themselves and compare themselves with themselves, they are without understanding.
2 Corinthians 10:12
'Because you say, "I am rich, and have become wealthy, and have need of nothing," and you do not know that you are wretched and miserable and poor and blind and naked,
To the angel of the church in Sardis write: He who has the seven Spirits of God and the seven stars, says this : 'I know your deeds, that you have a name that you are alive, but you are dead.'
Search me, O God, and know my heart; Try me and know my anxious thoughts; And see if there be any hurtful way in me, And lead me in the everlasting way.