A. L. M. Nicolas, in his book "Essai sur le Shaykhisme," pp. 19-20, refers to a second letter addressed by the Shah to Shaykh Ahmad: "The Shah, forewarned, wrote again telling him that evidently it was his duty, his, the King's, to go out of his way to come to Yazd to see the illustrious and holy person whose feet were a blessing to the province upon whose soil they had trodden, but because of political reasons of high importance he could not, at this moment, leave the capital. Besides it was necessary, he said, in case of change of residence, to bring with him a force of at least ten thousand men, and, as the town of Yazd was too small to support such a large population, the arrival of so many troops would most certainly occasion a famine. `You would not wish such a calamity to occur, I am quite certain, and I think therefore that, although I am of very small importance compared to you, you will consent, nevertheless to come to me.'"