"It is written: 'Man does not live on bread alone, but on every word that comes from the mouth of God.'"
This verse has been one of my favorites for a long time, but just a few years ago, it came to hold even more significance for me. The above statement of Jesus is found in Matthew 4:4, and it's one that my home church used back in 2010, when coming up with a title for our year-long trek through the entirety of scripture; we called our journey "Project 4:4". (Incidentally, that quote of Jesus is also in Luke 4:4!)
This quote of Jesus is found as His response to Satan's temptation. Jesus has been in the desert, fasting 40 days, when Satan tells Him, "If you're the Son of God, tell these stones to become bread." But rather than give in to temptation, Jesus responds with a quote from the Old Testament, one which emphasizes that as humans, our real sustenance comes from God alone.
Jesus' quote here from Deut. 8 is Moses' instructions to the Israelites after they have wandered forty years in the desert. Before they would enter the promised land, he instructs them, "Remember how the Lord your God led you all the way in the wilderness these forty years, to humble and test you in order to know what was in your heart, whether or not you would keep his commands. He humbled you, causing you to hunger and then feeding you with manna, which neither you nor your ancestors had known, to teach you that man does not live on bread alone but on every word that comes from the mouth of the Lord. Your clothes did not wear out and your feet did not swell during these forty years."
Ever since God has been calling man and challenging him to journey with and toward Him, He has also been fully providing and equipping each person with everything needed to make that journey. It was true for Moses & the Israelites. It was true for Noah...Abraham...Gideon...Samuel...Jeremiah...Jonah...Peter...John...Paul...and everyone in between. Show me someone God has called into relationship with Himself, and I will show you someone for whom God has provided.
Yet sometimes this can still be such a difficult lesson to remember. Since Jesus seemed to be so well aware of this while fasting, it's something that I also try to remember through prayer and fasting. So that as I present my requests to Him--and they are many--the hunger reminds me that I should desire nothing as much as I desire a relationship with Him. It serves as a reminder that He alone is the one that can satisfy all the other needs; and He alone knows best how to satisfy all the other needs. For He is the God Who Provides. He is Jehovah-Jireh.