I sent my Soul through the Invisible, Some letter of that After-life to spell: And by and by my Soul return'd to me, And answer'd "I Myself am Heav'n and Hell."

解释风水学中龙脉与宝藏的关系，认为龙脉汇聚之地常藏有珍贵之物。

理解计算的极限与理解其可能性同样重要。