“A warrior lives by acting, not by thinking about acting, nor by thinking about what he will think when he has finished acting.”

Source: Carlos Castaneda (1971) Separate Reality: Conversations With Don Juan. p. 85; As cited in: Eugene Dupuis (2001) Time Shift: Managing Time to Create a Life You Love. Ch. 5: Self Management

Preface, Second edition (21 June 1849)
The Nemesis of Faith (1849)

On acting. [Several Interviews with Timothy Dalton on his 007 portrayal, including ‘Licence to Act: Timothy Dalton Uses James Bond To Get What He Wants’ by Marshall Fine, taken from ‘Lifestyle’ magazine, 11 July 1989., http://www.geocities.com/Hollywood/Film/7518/Bond_Eng/Bond_Eng.htm, http://web.archive.org/20000304095759/www.geocities.com/Hollywood/Film/7518/Bond_Eng/Bond_Eng.htm, 2000-03-04].
Attributed

Søren Kierkegaard, Two Ages: A Literary Review, 1846, Hong 1978/2009, pp. 67–68
1840s, Two Ages: A Literary Review (1846)
Context: It is not uncommon to hear a man who has become confused about what he should do in a particular situation complain about the unique nature of the situation, thinking that he could easily act if the situation were a great event with only one either/or. This is a mistake and a hallucination of the understanding. There is no such situation. The presence of the crucial either/or depends upon the individual’s own impassioned desire directed toward acting decisively, upon the individual’s own intrinsic competence, and therefore a competent man covets an either/or in every situation because he does not want anything more. But as soon as the individual no longer has essential enthusiasm in his passion but is spoiled by letting his understanding frustrate him every time he is going to act, he never in his life discovers the disjunction. And even if his penetrating, resourceful understanding is adequate for managing an entire household, he still has not had an understanding of his life in advance or in the moment of action, and it cannot be understood afterwords, either, because the action essentially did not take place, and the coherence of his life, became a garrulous continuation or a continued garrulity, a participial or infinitive phrase in which the subject must be understood or, more correctly, cannot be located at all because, as the grammarians say, the meaning does not make it clear for the simple reason that it lacks meaning. The whole thing becomes a flux, a blend of a little resolution and a little situation, a little prudence and a little courage, a little probability and a little faith, a little action and a little incident. Anyone who has made the fraudulent trade of getting abnormally good sense by losing the capacity to will and the passion to act is very inclined to stiffen his spinelessness with various and sundry predeliberations that feel their way ahead and various and sundry postmortem reinterpretations of what happened. Compared to this, an action is a brief something and apparently a poor something, yet it is in fact a definite something. The other is more splendid, but for all that it is a splendid shabbiness.

As quoted in A Taste of Death: Thirty Days with U.G. in Gstaad, Switzerland http://www.scribd.com/doc/3101240/A-Taste-of-Death (1995) by Mahesh Bhatt. Bhatt precedes this quote with the observation "You are what you do, not what you say you want to do" which has sometimes been misquoted as part of Krishnamurti's statement.

Source: The Wheel of Time: Shamans of Ancient Mexico, Their Thoughts About Life, Death and the Universe], (1998), Quotations from A Separate Reality (Chapter 6)

Introduction.
An American Bible (1912)
Context: Elbert Hubbard sees, too, that just so long as there is one woman who is denied any right that man claims for himself, there is no free man; that no man can be a superior, true American so long as one woman is denied her birthright of life, liberty and happiness.
He knows that freedom to think and act, without withholding that right from any other, evolves humanity — Therefore he gives his best energy to inspiring men and women to think and to act, each for himself. He pleads for the rights of children, for so-called criminals, for the insane, the weak, and all those who having failed to be a friend to themselves, need friendship most. The Golden Rule is his rule of life.
His work is to emancipate American men and women from being slaves to useless customs, outgrown mental habits, outgrown religion, outgrown laws, outgrown superstitions. He would make each human being rely upon himself for health, wealth and happiness.

Source: The Characteristics of the Present Age (1806), p. 21

Source: The Four Purposes of Life: Finding Meaning and Direction in a Changing World