The good diarist writes either for himself alone or for a posterity so distant that it can safely hear every secret and justly weigh every motive. For such an audience there is need neither of affectation nor of restraint. Sincerity is what they ask, detail, and volume; skill with the pen comes in conveniently, but brilliance is not necessary; genius is a hindrance even; and should you know your business and do it manfully, posterity will let you off mixing with great men, reporting famous affairs, or having lain with the first ladies in the land.
Open your refrigerator door, and you summon forth more light than the total amount enjoyed by most households in the 18th century. The world at night, for much of history, was a very dark place, indeed.