What is the meaning of [A new broome sweepeth cleane]

“We should never use an old tool when the extra labor in consequence costs more than a new one. Thousands wear out their lives and waste their time merely by the use of dull and unsuitable instruments.”,”We often apply it to exchanges among servants, clerks, or any persons employed, whose service, at first, in any new place, is very good, both efficient and faithful; but very soon, when all the new circumstances have lost their novelty, and all their curiosity has ceased, they naturally fall into their former and habitual slackness.”