the quantity of a hazel nut

And in this he showed me a little thing, the quantity of a hazel nut, lying in the palm of my hand, as it seemed. And it was as round as any ball. I looked upon it with the eye of my understanding, and thought, 'What may this be?' And it was answered generally thus, 'It is all that is made.' I marveled how it might last, for I thought it might suddenly have fallen to nothing for littleness.