“We--by whom I mean anyone over sixty--commit two offenses just bu existing. One is Lack of Velocity. We drive too slowly, walk to slowly, talk too slowly. The world will do business with dictators, perverts, and drugs barons of all stripes, but being slowed down it cannot abide. Our second offence is being Everyman's memento mori. The world can only get comfy in shiny-eyed denial if we are out of sight.”

Source: Becoming Human

Source: The Winter of Our Discontent

Speech to the Labour Party Conference in Scarborough (6 October 1960) in favour of revising Clause IV, quoted in The Times (7 October 1960), p. 20
1960s

Bill signing ceremony for California's strict anti-emissions law (26 September, 2006) http://www.msnbc.msn.com/id/15029070/.
2000s

Likely spurious quote, UNVERIFIED ATTRIBUTE - Quoted in The Lexington Observer & Reporter (16 June 1864)
1860s
Variant: I am a slow walker, but I never walk back.

The Making of Americans (1925)
Context: There are many that I know and I know it. They are many that I know and they know it. They are all of them themselves and they repeat it and I hear it. Always I listen to it. Slowly I come to understand it. Many years I listened and did not know it. I heard it, I understood it some, I did not know I heard it. They repeat themselves now and I listen to it. Every way that they do it now I hear it. Now each time very slowly I come to understand it. Always it comes very slowly the completed understanding of it, the repeating each one does to tell it the whole history of the being in each one, always now I hear it. Always now slowly I understand it.

As quoted in Great Hollywood Wit: A Glorious Cavalcade of Hollywood Wisecracks, Zingers, Japes, Quips, Slings, Jests, Snappers, & Sass from the Stars (2003) by Gene Shalit, p. 46

As I myself read.
Source: Culture and Value (1980), p. 77e

Source: Saffy's Angel