through the hypocrisy of men who speak lies, branded in their own conscience as with a hot iron;

 Into the Church at Ephesus such false teachers had come. The way in which their false teaching is regarded in this passage should make us think very seriously. At that time men believed in evil spirits who haunted the air and were out to ruin men. It was from them that this false teaching came. But though it came from the demons, it came through men. It came through men whose characteristic was a smooth hypocrisy and whose consciences had been branded by Satan. It sometimes happened that a slave was branded with a mark identifying him as belonging to a certain owner. These false teachers bear upon their consciences the very brand of Satan, marking them out as his property. 