“If any man can convince me and bring home to me that I do not think or act aright, gladly will I change; for I search after truth, by which man never yet was harmed. But he is harmed who abideth on still in his deception and ignorance.”

Remark to Gen. Edward H. Ripley (5 April 1865), recalled during Ripley's speech http://books.google.com/books?id=1OoSAAAAYAAJ&pg=PA353&dq=believe at the 41st annual meeting of the Reunion Society of Vermont Officers (1 November 1904)
Posthumous attributions

41c–e
Plato, Apology

Thomas More's Account, in a letter to his daughter Margaret Roper, of his Second Interrogation

Source: Batman: Year One

1940s, Science and Religion (1941)
Context: It would not be difficult to come to an agreement as to what we understand by science. Science is the century-old endeavor to bring together by means of systematic thought the perceptible phenomena of this world into as thoroughgoing an association as possible. To put it boldly, it is the attempt at the posterior reconstruction of existence by the process of conceptualization. But when asking myself what religion is I cannot think of the answer so easily. And even after finding an answer which may satisfy me at this particular moment, I still remain convinced that I can never under any circumstances bring together, even to a slight extent, the thoughts of all those who have given this question serious consideration.

Trevor Kavanagh, "Blair: My big blunder", The Sun, 17 November 1997, p. 8.
Interview with John Humphrys on BBC TV's "On the Record", 16 November 1997.
1990s

Mi dignidad le pide a quien no me hace daño que no me haga daño, y a quien me hace daño no le pide nada.
Voces (1943)

Source: The Darkest Whisper