This has happened because of ignorance and presumption on the part of those to whom the
execution has been entrusted, and who are being well paid and compensated for it. And I
have written this so that if it befalls which all reason tells me must befall, and the
building is spoiled and put in danger of ruin, I shall be excused and blameless. For
God's sake, be prudent, which I am certain you will be. Think of the danger that befell
the cathedral of Siena for trusting a dreamer incapable of reasoning.