Reply To: Belief Phrase Variations
Also try looking for other possibly unrelated coincidental minor events at the time your Father said such things, that confirmed the words he said to you were true. Even though his joking and smile gave you the impression that he was just joking. Normally the body language is correct and the words meaningless but the contradiction between the two can be confusing for a child. So if something else happened to you that made the words seem correct then maybe you came to believe his words.
I wish I knew how words held such power when my kids were young. I would have been more careful about how I said things to them. Your body language says what you feel louder than your words.