“When Christ said to the tempter, ‘Man shall not live by bread alone, but by every word that proceedeth out of the mouth of God,’ He repeated the words that, more than fourteen hundred years before, He had spoken to Israel: ‘The Lord thy God led thee these forty years in the wilderness. . . . And He humbled thee, and suffered thee to hunger, and fed thee with manna, which thou knewest not, neither did thy fathers know; that He might make thee know that man doth not live by bread only, but by every word that proceedeth out of the mouth of the Lord doth man live.’ Deuteronomy 8:2, 3. In the wilderness, when all means of sustenance failed, God sent His people manna from heaven; and a sufficient and constant supply was given. This provision was to teach them that while they trusted in God and walked in His ways He would not forsake them. The Saviour now practiced the lesson He had taught to Israel. By the word of God succor had been given to the Hebrew host, and by the same word it would be given to Jesus. He awaited God's time to bring relief. He was in the wilderness in obedience to God, and He would not obtain food by following the suggestions of Satan. In the presence of the witnessing universe, He testified that it is a less calamity to suffer whatever may befall than to depart in any manner from the will of God.
“ ‘Man shall not live by bread alone, but by every word of God.’ Often the follower of Christ is brought where he cannot serve God and carry forward his worldly enterprises. Perhaps it appears that obedience to some plain requirement of God will cut off his means of support. Satan would make him believe that he must sacrifice his conscientious convictions. But the only thing in our world upon which we can rely is the word of God. ‘Seek ye first the kingdom of God, and His righteousness; and all these things shall be added unto you.’ Matthew 6:33. Even in this life it is not for our good to depart from the will of our Father in heaven. When we learn the power of His word, we shall not follow the suggestions of Satan in order to obtain food or to save our lives. Our only questions will be, What is God's command? and what His promise? Knowing these, we shall obey the one, and trust the other. . . .
“And how this is accomplished, Christ has shown us. By what means did He overcome in the conflict with Satan? By the word of God. Only by the word could He resist temptation. ‘It is written,’ He said. And unto us are given ‘exceeding great and precious promises: that by these ye might be partakers of the divine nature, having escaped the corruption that is in the world through lust.’ 2 Peter 1:4. Every promise in God's word is ours. ‘By every word that proceedeth out of the mouth of God’ are we to live. When assailed by temptation, look not to circumstances or to the weakness of self, but to the power of the word. All its strength is yours. ‘Thy word,’ says the psalmist, ‘have I hid in mine heart, that I might not sin against Thee.’ ‘By the word of Thy lips I have kept me from the paths of the destroyer.’ Psalm 119:11; 17:4.” (Ellen G. White, The Desire of Ages (Mountain View, CA: Pacific Press, 1898), 121–23.)