The secret of the truly successful, I believe, is that they learned very early in life how not to be busy. They saw through that adage, repeated to me so often in childhood, that anything worth doing is worth doing well. The truth is, many things are worth doing only in the most slovenly, halfhearted fashion possible, and many other things are not worth doing at all.
— Barbara Ehrenreich

One of the great undiscovered joys of life comes from doing everything one attempts to the best of one's ability. There is a special sense of satisfaction, a pride in surveying such a work, a work which is rounded, full, exact, complete in its parts, which the superficial person who leaves his or her work in a slovenly, slipshod, half-finished condition, can never know. It is this conscientious completeness which turns any work into art. The smallest task, well done, becomes a miracle of achievement.
Og Mandino slovenly quote

Rhymes, meters, stanza forms, etc., are like servants. If the master is fair enough to win their affection and firm enough to command their respect, the result is an orderly happy household. If he is too tyrannical, they give notice; if he lacks authority, they become slovenly, impertinent, drunk and dishonest.
— W. H. Auden

It is indolence... Indolence and love of ease; a want of all laudable ambition, of taste for good company, or of inclination to take the trouble of being agreeable, which make men clergymen. A clergyman has nothing to do but be slovenly and selfish; read the newspaper, watch the weather, and quarrel with his wife. His curate does all the work and the business of his own life is to dine.
— Jane Austen

Most of the time when I receive a script, it says something like 'Rosenberg is the fat, slovenly Mayor, who doesn't want the kids to use the skateboard park', or 'Stein is a pompous, rotund attorney, imposing to all.' It would be so freeing to get a script where my character is simply described as 'A Man'.
— Fred Melamed