Roxana, The Fortunate Mistress by Daniel Defoe

In all this affluence of my good fortune I did not forget that I had been rich and poor once already, alternately, and that I ought to know that the circumstances I was now in were not to be expected to last always; that I had one child and expected another, and if I bred often it would something impair me in the great article that supported my interest, I mean what he called beauty; that as that declined I might expect the fire would abate, and the warmth with which I was now so caressed would cool, and in time, like the other mistresses of great men, I might be dropped again; and that, therefore, it was my business to take care that I should fall as softly as I could.

I say I did not forget, therefore, to make as good provision for myself as if I had had nothing to have subsisted on but what I now gained, whereas I had not less than ten thousand pounds, as I said above, which I had amassed, or secured rather, out of the ruins of my faithful friend the jeweller; and which, he little thinking of what was so near him when he went out, told me, though in a kind of a jest, was all my own if he was knocked on the head, and which, upon that title, I took care to preserve.