"If you want to abolish a habit, and its accumulated circumstances
as well, you must grapple with the matter as earnestly as you would
with a physical enemy. You must go into the encounter with all
tenacity of determination, with all fierceness of resolve--yea, even
with a passion for success that may be called vindictive. No human enemy can be as insidious, so persevering, as unrelenting as an
unfavorable habit. It never sleeps, it needs no rest."