Absolutely not. You should examine every thought.

Here is one such mental Skype session which shows how to handle it:

Then Jesus was led by the Spirit into the wilderness to be tempted by the devil. After fasting forty days and forty nights, he was hungry.
Satan came to him and said, "If you are the Son of God, tell these stones to become bread."
Jesus answered, "It is written: 'Man shall not live on bread alone, but on every word that comes from the mouth of God.'" = Matthew 4:1-4