Notice that Jesus defeated Satan every time by quoting scripture. In this Jesus was teaching us that the word of God is our sword and shield in spiritual warfare. Arm yourself with a deep knowledge of the Bible and you will have tremendous power to overcome obstacles in life, to defeat demonic enemies that come against you, and to wage war victoriously against the giants of sin and lust which cause even the strongest humans to fall under temptation. The word of God is powerful.

You will also find if you do some research that every scripture Jesus cites in this episode comes from the book of Deuteronomy. It is most impressive when you study it in the original, unaltered English Bible, the 1611 King James Version.