If Satan had tempted Jesus 1000 times, Jesus would have responded 1000 times with, 'It is written!' And so should we, in all of our ways. However, in order to resist temptation with what is written, we must know what is written.
Luke 4:4 KJV And Jesus answered him, saying, It is written, That man shall not live by bread alone, but by every word of God.
