I set to make some strict rules for my future practice in my expenses, which I did bind myself in the presence of God by oath to observe, upon penaltys therein set down. And I do not doubt but hereafter to give a good account of my time and to grow rich—for I do find a great deal more of content in those few days that I do spend well about my business then in all the pleasures of a whole week.

Samuel Pepys, Diary of Samuel Pepys, 1669