From the From the 1853 New England Economical Housekeeper and Family Receipt Book:
397. A Good Rule.
Whenever you enter an apartment occupied by another individual, if the door is closed before you enter, close it after you. If, on the contrary, it stands invitingly open, let it remain so.
399. Jefferson's Two Rules.
Two rules of Jefferson are very applicable to the times: "Never spend your money before you get it;" and "Never buy what you do not want because it is cheap."