" The art of communication, Lincoln advised newcomers to the bar, “is the lawyer’s avenue to the public.” Yet, Lincoln warned, the lawyer must not rely on rhetorical glibness or persuasiveness alone. What is well-spoken must be yoked to what is well-thought. And such thought is the product of great labor, “the drudgery of the law.” Without that labor, without that drudgery, the most eloquent words lack gravity and power. Even “extemporaneous speaking should be practiced and cultivated.” Indeed, “the leading rule for the lawyer, as for the man of every other calling, is diligence. Leave nothing for tomorrow that can be done to-day.” The key to success, he insisted, is “work, work, work. "

― Doris Kearns Goodwin , Leadership: In Turbulent Times