From David Maraniss' 1999 biography of Vince Lombardi, When Pride Still Mattered:
Lombardi had used the sweep in New York, and had originally borrowed it from the playbook of the Los Angeles Rams, but once he arrived in Green Bay he transformed it into something that was singularly identified with him and the Packers. Since his days at West Point, he had based his coaching philosophy on Red Blaik's belief that perfection came with slimplicity. The theory was to discard the immaterial and refine those few things that one did best.
Years later, looking back on his development of the power sweep, Lombardi suggested that "every team arrives at a lead play, a No. 1 play, a bread and butter play. It is the play that the team knows it must make go and the one that opponents know they must stop. Continued success with it of course makes a No. 1 play because from that success stems your own team's confidence. And behind that is the basic truth that it expresses a coach as a coach and the players as a team. And they feel copmlete satisfaction when they execute it successfully."
Tags: Vince Lombardi, David Maraniss, When Pride Still Mattered