(Mat. 4) “1 Then was Jesus led up of the Spirit into the wilderness to be tempted of the devil. 2 And when he had fasted forty days and forty nights, he was afterward an hungred. 3 And when the tempter came to him, he said, If thou be the Son of God, command that these stones be made bread. 4 But he answered and said, It is written, Man shall not live by bread alone, but by every word that proceedeth out of the mouth of God.”

My interpretation is the following: Jesus followed a certain path in his life. In this path, he is fed bread together with word of God. If Jesus said as the word of God “let the stones become bread”, it would be that the word of God would finish in the stone and Jesus would receive bread without word of God because the word would have already finished its mission in the stone.

If Jesus behaved this way, the devil would be able to kill Jesus, because he would leave thin path where Jesus every time he eat bread also received a word of God. Jesus would be left for some time without guidance of word of God and therefore the devil would be able to kill him. (Jesus would be not live by word of God.)