“But as a matter of fact the idea of an integrated Europe is historically looking backward, and not forward. The noble Viscount was looking at the Holy Roman Empire. We never belonged to the Holy Roman Empire, and we never belonged to the reactionary organisation after 1815. We have always looked outward, out to the New World; and to-day we look out to the New World, and to Asia and Africa. I think that integration with Europe is a step backward. By all means let us get the greatest possible agreement between the various continents, but I am afraid that if we join the Common Market we shall be joining not an outward-looking organisation, but an inward-looking organisation. I think that Germany, for instance, which has probably the most powerful influence in the organisation, will not escape from looking at what she thought she was going to gain, and what she has lost. I do not think we have a new look there. I think that by marrying into Europe we are marrying a whole family of ancient prejudices and ancient troubles, and I would much rather see an Atlantic organisation. I would much rather work for the world organisation.”

Volume iii, p. 274
Reflections on the Revolution in France (1790)

Letter http://eText.Lib.Virginia.edu/etcbin/toccer-new2?id=JefLett.sgm&images=images/modeng&data=/texts/english/modeng/parsed&tag=public&part=136&division=div1 to Dr. Joseph Priestley (21 March 1801); published in The Life of Thomas Jefferson (1871) by Henry Stephens Randall, Vol. 2, p. 644; this seems to be the source of a misleading abbreviation: "[Christianity is] the most … perverted system that ever shone on man".
1800s, First Presidential Administration (1801–1805)
Context: Yours is one of the few lives precious to mankind, and for the continuance of which every thinking man is solicitous. Bigots may be an exception. What an effort, my dear sir, of bigotry in politics and religion have we gone through! The barbarians really flattered themselves they should be able to bring back the times of Vandalism, when ignorance put everything into the hands of power and priestcraft. All advances in science were proscribed as innovations. They pretended to praise and encourage education, but it was to be the education of our ancestors. We were to look backwards, not forwards, for improvement … This was the real ground of all the attacks on you. Those who live by mystery & charlatanerie, fearing you would render them useless by simplifying the Christian philosophy — the most sublime and benevolent, but most perverted system that ever shone on man — endeavored to crush your well-earned & well-deserved fame.

Ce corps qui s'appelait et qui s'appelle encore le saint empire romain n'était en aucune manière ni saint, ni romain, ni empire.
Essai sur l'histoire générale et sur les mœurs et l'esprit des nations, Chapter 70 (1756)
Citas

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 319.

Context: It seems impossible to believe that Life, so rare a fruit of the universe, intelligent Life, conscious Life, to which the long course of evolution has been so manifestly leading up all through the long ages, should have no better destiny than a final and hopeless extinction; that this Earth and all the efforts and aspirations of the long generations of men should have no worthier end than to swing, throughout the eternal ages, an empty, frozen heap of dust, circling round the extinct cinder that was once its Sun. If we look backward, we seem to discern clear signs of progress; if we look forward, we discern nothing but the veil. Science is but organized experience, and experience of the future we have none.

U.S. president George Bush made those comments on January 1, 1990. The Watchtower magazine; In Search of a New World Order (15 July 1991)

As quoted in the film Meet the Robinsons.
Variant: Around here, however, we don't look backwards for very long. We keep moving forward, opening up new doors and doing new things, because we're curious... and curiosity keeps leading us down new paths.

Source: A Long Search for Information (2004), p. 29.

Letter to E. Ray Lankester (11 April 1892) Huxley Papers, Imperial College: 30.448
1890s