“We should not permit tolerance to degenerate into indifference.”

Part 3: "The Sense of Human Dignity", §6 (p. 63–64)
Science and Human Values (1956, 1965)
Context: Tolerance among scientists cannot be based on indifference, it must be based on respect. Respect as a personal value implies, in any society, the public acknowledgements of justice and of due honor. These are values which to the layman seem most remote from any abstract study. Justice, honor, the respect of man for man: What, he asks, have these human values to do with science? [... ]
Those who think that science is ethically neutral confuse the findings of science, which are, with the activity of science, which is not.

Source: Nietzsche: Life as Literature (1985), p. 28.

Letter to A.S. Suvorin (December 27, 1889)
Letters

May the Source Be With You (2001)
Context: While control is needed, and perfectly warranted, our bias should be clear up front: Monopolies are not justified by theory; they should be permitted only when justified by facts. If there is no solid basis for extending a certain monopoly protection, then we should not extend that protection. This does not mean that every copyright must prove its value initially. That would be a far too cumbersome system of control. But it does mean that every system or category of copyright or patent should prove its worth. Before the monopoly should be permitted, there must be reason to believe it will do some good — for society, and not just for monopoly holders.

Source: River out of Eden (1995), pp. 131–132
Context: The total amount of suffering per year in the natural world is beyond all decent contemplation. During the minute it takes me to compose this sentence, thousands of animals are being eaten alive; others are running for their lives, whimpering with fear; others are being slowly devoured from within by rasping parasites; thousands of all kinds are dying of starvation, thirst and disease. [... ] In a universe of blind physical forces and genetic replication, some people are going to get hurt, other people are going to get lucky, and you won't find any rhyme or reason in it, nor any justice. The universe we observe has precisely the properties we should expect if there is, at bottom, no design, no purpose, no evil and no good, nothing but blind, pitiless indifference. DNA neither knows nor cares. DNA just is. And we dance to its music.

Vol. 1, Notes to the Chapters: Ch. 7, Note 4
The Open Society and Its Enemies (1945)
Context: The so-called paradox of freedom is the argument that freedom in the sense of absence of any constraining control must lead to very great restraint, since it makes the bully free to enslave the meek. The idea is, in a slightly different form, and with very different tendency, clearly expressed in Plato.
Less well known is the paradox of tolerance: Unlimited tolerance must lead to the disappearance of tolerance. If we extend unlimited tolerance even to those who are intolerant, if we are not prepared to defend a tolerant society against the onslaught of the intolerant, then the tolerant will be destroyed, and tolerance with them. — In this formulation, I do not imply, for instance, that we should always suppress the utterance of intolerant philosophies; as long as we can counter them by rational argument and keep them in check by public opinion, suppression would certainly be unwise. But we should claim the right to suppress them if necessary even by force; for it may easily turn out that they are not prepared to meet us on the level of rational argument, but begin by denouncing all argument; they may forbid their followers to listen to rational argument, because it is deceptive, and teach them to answer arguments by the use of their fists or pistols. We should therefore claim, in the name of tolerance, the right not to tolerate the intolerant. We should claim that any movement preaching intolerance places itself outside the law, and we should consider incitement to intolerance and persecution as criminal, in the same way as we should consider incitement to murder, or to kidnapping, or to the revival of the slave trade, as criminal.

In 1647, as quoted in "Free Speech and Its Present Crisis" https://www.city-journal.org/free-speech-crisis (2018), by Allen C. Guelzo, City Journal

Address to the World Evangelical Congress in Berlin (28 October 1966).
Context: This age above all ages is a period in history when it should be our prime duty to preach the Gospel of Grace to all our fellow men and women. The love shown in Christ by our God to mankind should constrain all of us who are followers and disciples of Christ to do all in our power to see to it that the Message of Salvation is carried to those of our fellows for whom Christ Our Saviour was sacrificed but who have not had the benefit of hearing the good news. Since nobody can interfere in the realm of God we should tolerate and live side by side with those of other faiths.

Source: Letters, p. 91