“We cannot be too energetic in reminding our nihilists and positivists that this is a world of action and history.”

Source: The Birth of Tragedy (1872), p. 73
Context: We cannot help but see Socrates as the turning-point, the vortex of world history. For if we imagine that the whole incalculable store of energy used in that global tendency had been used not in the service of knowledge but in ways applied to the practical — selfish — goals of individuals and nations, universal wars of destruction and constant migrations of peoples would have enfeebled man's instinctive zest for life to the point where, suicide having become universal, the individual would perhaps feel a vestigial duty as a son to strangle his parents, or as a friend his friend, as the Fiji islanders do: a practical pessimism that could even produce a terrible ethic of genocide through pity, and which is, and always has been, present everywhere in the world where art has not in some form, particularly as religion and science, appeared as a remedy and means of prevention for this breath of pestilence.

A Propos of Lady Chatterley's Lover (1929)
Context: We are today, as human beings, evolved and cultured far beyond the taboos which are inherent in our culture. This is a very important fact to realise. Probably, to the Crusaders, mere words were potent and evocative to a degree we can't realise. The evocative power of the so-called obscene words must have been very dangerous to the dim-minded, obscure, violent natures of the Middle Ages, and perhaps are still too strong for slow-minded, half-evoked lower natures today. But real culture makes us give to a word only those mental and imaginative reactions which belong to the mind, and saves us from violent and indiscriminate physical reactions which may wreck social decency. In the past, man was too weak-minded, or crude-minded, to contemplate his own physical body and physical functions, without getting all messed up with physical reactions that overpowered him. It is no longer so. Culture and civilisation have taught us to separate the reactions. We now know the act does not necessarily follow on the thought. In fact, thought and action, word and deed, are two separate forms of consciousness, two separate lives which we lead. We need, very sincerely, to keep a connection. But while we think, we do not act, and while we act we do not think. The great necessity is that we should act according to our thoughts, and think according to our acts. But while we are in thought we cannot really act, and while we are in action we cannot really think. The two conditions, of thought and action, are mutually exclusive. Yet they should be related in harmony.

2009, Nobel Prize acceptance speech (December 2009)
Context: I receive this honor with deep gratitude and great humility. It is an award that speaks to our highest aspirations — that for all the cruelty and hardship of our world, we are not mere prisoners of fate. Our actions matter, and can bend history in the direction of justice.
And yet I would be remiss if I did not acknowledge the considerable controversy that your generous decision has generated. In part, this is because I am at the beginning, and not the end, of my labors on the world stage. Compared to some of the giants of history who've received this prize — Schweitzer and King; Marshall and Mandela — my accomplishments are slight. And then there are the men and women around the world who have been jailed and beaten in the pursuit of justice; those who toil in humanitarian organizations to relieve suffering; the unrecognized millions whose quiet acts of courage and compassion inspire even the most hardened cynics. I cannot argue with those who find these men and women — some known, some obscure to all but those they help — to be far more deserving of this honor than I.
But perhaps the most profound issue surrounding my receipt of this prize is the fact that I am the Commander-in-Chief of the military of a nation in the midst of two wars. One of these wars is winding down. The other is a conflict that America did not seek; one in which we are joined by 42 other countries — including Norway — in an effort to defend ourselves and all nations from further attacks.
Still, we are at war, and I'm responsible for the deployment of thousands of young Americans to battle in a distant land. Some will kill, and some will be killed. And so I come here with an acute sense of the costs of armed conflict — filled with difficult questions about the relationship between war and peace, and our effort to replace one with the other.

Source: The Mind of God: The Scientific Basis for a Rational World (1992), Ch. 9: 'The Mystery at the End of the Universe', p. 232

On her aim in “Interview with Nilaja Sun” https://www.voicemag.uk/interview/2818/interview-with-nilaja-sun (2017 Aug 6)

Source: Cutting for Stone

Source: Information Space, 1995, p. 22

Thee Reversal of Fate

Source: Phenomenology of Perception