Jeremiah 7

Do not trust in these lying words, saying, ‘The temple of the Lord, the temple of the Lord, the temple of the Lord are these.’ v.4

Read chapter 7
The Titanic was so great that it was thought unsinkable.  So the Lord's temple that Solomon built was so great the people thought it was indestructible.  Yet the Titanic sank and Israel's temple was destroyed.  As long as the temple stood, the Israelites thought secure their independence and dominion.  Lying prophets were common in the days of Jeremiah and would speak what the people wanted to hear rather than the truth, having them do religious exercises that were of no avail.  The threefold repetition of them saying the "The temple of the Lord" took after the divine symbol of the Lord such as we read "Holy holy holy is the Lord God Almighty," yet these ceremonial words don't make it true just because they followed a pattern.  Just because they were repeating these words didn't make this false idea that the temple would never be destroyed come true.  So repetition of any lie doesn't make it eventually truth, yet how often we tell ourselves a lie for so long or hear a lie over and over again that we start to believe it is true?  
What lie have you been repeating or hearing for so long that you think of it as true now?