Deuteronomy 8:3 ASV

When the Isralites were in the desert, God didn't just give them manna to feed them physically, He was trying to get them into a relationship of spiritual dependence, where the words that come from His mouth are what they lived on, depended on and fed on. The thing about manna is that it's best eaten when its FRESH. So like manna, reading the Bible on a daily basis is the FRESHEST way to absorb it, and grow closer into relationship with God