We can see an example of this when he was tempting Jesus for He said, "If You are the Son of God, command that these stones become bread." … "If You are the Son of God, throw Yourself down." (Matthew 4)
The devil knew that Jesus was the Son of God yet by beginning his questions with “If You are ...” he was suggesting that Jesus was not the Son of God and therefore trying to make Him prove it.
Therefore, learn from Jesus that you do not have to prove anything to anyone let alone the devil.
Understand also that you only have to live to please God because in the final analysis, Everyone must give an account of himself to God. (Romans 14:12)