Matthew 6:7
And when you pray, do not repeat empty phrases as the heathen do, for they imagine that their prayers will be heard if they use words enough.
Matthew 23:13
"But alas for you, you hypocritical scribes and Pharisees, for you lock the doors of the Kingdom of Heaven in men's faces, for you will neither go in yourselves nor let those enter who are trying to do so.
Luke 13:25-28
when the master of the house gets up and shuts the door, and you begin to stand outside and to knock on the door, and say, 'Open it for us, sir!' Then he will answer you and say, 'I do not know where you come from,'
1 Timothy 2:8
I want the men everywhere to offer prayer, lifting to heaven hands that are holy, without any angry disputes.