The Wealth of Nations by Part 2 Chapter 2 Page 71

propriety, carry on a very considerable part of their projects with borrowed money. In justice to their creditors, however, their own capital ought, in this case, to be sufficient to ensure, if I may say so, the capital of those creditors; or to render it extremely improbable that those creditors should incur any loss, even though the success of the project should fall very much short of the expectation of the projectors. Even with this precaution too, the money which is borrowed, and which it is meant should not be repaid till after a period of several years, ought not to be borrowed of a bank, but ought to be borrowed upon bond or mortgage of such private people as propose to live upon the interest of their money without taking the trouble themselves to employ the capital, and who are upon that account willing to lend that capital to such people of good