After the first month or so, when he saw that I had such an aptitude and such a love for the figures themselves, as well as the wealth they represented, he let me see the accounts book for the small manor he had just bought, and said that I could keep it too, to see if I would manage it well. I did so. Then, as he bought more properties, I took care of them. I learned the wages of field laborers as well as housemaids; I learned how much we should pay for carting as well as for washing the windows. I started to run his farms as I ran our house and I kept the books for them all the same.

He taught me that it means nothing to own land or money as the old lords own their estates and waste them from one generation to another. Wealth means nothing at all if you do not know, to the last penny, what your fortune is. You might as well be poor if you do not know what you have. He taught me to love the order of a well-kept accounts book and how the bottom of the page at the end of each week should show the balance between money coming in and money going out, so that you know, and know to a penny, whether you are ahead in the world or behind.

Cavendish told me that this is not how the great lords do it. Many of their stewards do not even keep the books like this, the new way, with receipts and expenses put side by side for comparison, and this is why, at the end of the day, we will do better than them. He told me that they treat their houses and their lands and their tenants and their fortunes as if they were all a great mass that cannot be calculated. So—since this is what they believe—they never try to calculate their wealth. They inherit and pass it on wholesale, without inventory. They lose and gain without keeping account. They have no idea whether a townhouse should rent out at a greater profit than a wheatfield. When they are taxed they guess at what they are worth; when they borrow money they cannot calculate their fortune. When they are paid a huge sum in war, or inherit treasure on marriage, they tumble it into their strongroom and never even list it. Whereas we, the new men and women who have risen so recently, we look at every field, at every trade, at every ship, and we see that it pays for itself.