Missing it on multiple levels...

When the disciples reached the other side, they had forgotten to bring any bread. Jesus said to them, “Watch and beware of the leaven of the Pharisees and Sadducees.” And they began discussing it among themselves, saying, “We brought no bread.” But Jesus, aware of this, said, “O you of little faith, why are you discussing among yourselves the fact that you have no bread? Do you not yet perceive? Do you not remember the five loaves for the five thousand, and how many baskets you gathered? Or the seven loaves for the four thousand, and how many baskets you gathered? (Matthew 16:5-10 ESV) The Twelve had witnessed so much - far more than even the average Jewish resident around the Sea of Galilee: The miracles, the marvelous teaching, and the Man Himself. Yet, putting it all together was not always that easy. They failed to understand what Jesus was trying to impress upon them. They were thinking physical bread; He was talking the Bread of Life, the Word of God. They were thinking He was talking physical yeast; He was talking spiritual influence. We tend to automatically revert to the physical, even after spiritual high after spiritual high. He wants it to be a supernatural response for us to maintain a spiritual plane - always connected to the way He thinks. When that is the case, worrying about our next meal is not an issue; we know the great Provider, and we know His heart. We won't miss a meal, or a lesson.