MATTHEW 4:3
Three of the temptations satan used on Jesus began with: "If you be the Son of God." Jesus was God, but He occupied a human body that had to grow in knowledge and wisdom of His Father God. Satan attacked Jesus' belief of who He was.
Satan knew that Jesus was hungry or he wouldn't have used the turning of stones into bread to try tempt Him to waiver in His faith concerning being the Son of God.
We, on the other hand, fall for satan's tricks because we are not sure of our standing as a child of God. If we really know who we are in Christ, we don't have to prove ourselves just as Jesus had.
It's a must to meditate on God's Word which is the only way to build our faith in the fact that we are Children of God.