Matthew 16:8 - Ellicott's Commentary On The Whole Bible

O ye of little faith. — Our Lord reproves not the want of discernment which made them slow to receive the meaning of the similitude, but their want of faith. The discernment depended (in part, at least) on imaginative power, or acquired culture, for the lack of which they were not responsible. But their memory of the manner in which their wants had been twice supplied might at least have taught them that no such case of extreme necessity, such as they pictured to themselves, was likely to arise while He was with them, and therefore that their gross carnal interpretation of His words could not possibly be the true one. Memory in this case should have been an aid to faith, and faith, in its turn, would have quickened spiritual discernment.