“Experience can be merely the repetition of same error often enough.”

Es ist so gewiß als wunderbar, daß Wahrheit und Irrthum aus Einer Quelle entstehen; deßwegen man oft dem Irrthum nicht schaden darf, weil man zugleich der Wahrheit schadet.
Maxims and Reflections (1833)

Wallace v. Jaffree, 472 U.S. 38 (1985) ( dissenting opinion http://straylight.law.cornell.edu/supct/html/historics/USSC_CR_0472_0038_ZD2.html).
Judicial opinions

Source: What we live by (1932), p. 238

Relating his discovery of the magnetic effect of an electric current, in "Experiments on the Effect of a Current of Electricity on the Magnetic Needle", Annals of Philosophy 1820, vol. 16, pp. 273-277.

Source: Lord Arthur Savile's Crime and Other Stories

Foreword
My Life (1930)
Context: I know well enough, from my own experience, the historical ebb and flow. They are governed by their own laws. Mere impatience will not expedite their change. I have grown accustomed to viewing the historical perspective not from the stand point of my personal fate. To understand the causal sequence of events and to find somewhere in the sequence one's own place – that is the first duty of a revolutionary. And at the same time, it is the greatest personal satisfaction possible for a man who does not limit his tasks to the present day.

It – How Churches and Leaders Can Get It and Keep It (2008, Zondervan)

Academy of Achievement interview (1991)
Context: The idea of being constructive, creative, positive, in trying to bring out the best in one's own self and the best in others follows from what I've just been saying. Again, I repeat my belief in us, in ourselves, as the product of the process of evolution, and part of the process itself. I think of evolution as an error-making and error-correcting process, and we are constantly learning from experience. It's the need to dedicate one's self in that way, to one's own self, and to choose an activity or life that is of value not only to yourself but to others as well.

Source: The Picture of Dorian Gray