In 1 Chronicles 13 the ark of the covenant is being moved. When the ark started to topple Uzzah put his hand on the ark to stop it from falling. He was killed instantly. Had he forgotten the power that the Ark encompassed? Was he overfamiliar with what lay before him?
What about the story of the men using the temple to sell goods… Did they forget how sacred the temple was? Did they think oh well it’s just the temple I’m sure we could use it to sell our belongings? Had they become overfamiliar with the sacred place in which they encountered God?
The enemy wants to make you think you know God and the bible so you disengage your level of expectancy and disciplined habits. Can you now see how overfamiliarity is a dangerous weapon of the enemy?