John Bosco quote: “Not with violence, but with words.”

“The word ‘violence’ is being systematically remade to conform to their worldview. Looting and arson aren’t violence, they argue. And yet physical violence directed at their opponents is also not violence but rather ‘self-defense.’”

Andy Ngo (1986) American conservative journalist and social‐media personality

Source: Unmasked: Inside Antifa’s Radical Plan to Destroy Democracy (2021), p. 17

“Violence is not merely killing another. It is violence when we use a sharp word, when we make a gesture to brush away a person, when we obey because there is fear.”

Jiddu Krishnamurti (1895–1986) Indian spiritual philosopher

1960s, Freedom From The Known (1969)
Context: Violence is not merely killing another. It is violence when we use a sharp word, when we make a gesture to brush away a person, when we obey because there is fear. So violence isn't merely organized butchery in the name of God, in the name of society or country. Violence is much more subtle, much deeper, and we are inquiring into the very depths of violence.
When you call yourself an Indian or a Muslim or a Christian or a European, or anything else, you are being violent. Do you see why it is violent? Because you are separating yourself from the rest of mankind. When you separate yourself by belief, by nationality, by tradition, it breeds violence. So a man who is seeking to understand violence does not belong to any country, to any religion, to any political party or partial system; he is concerned with the total understanding of mankind.

“Where words prevail not, violence prevails;
 But gold doth more than either of them both.”

Thomas Kyd book The Spanish Tragedy

Act II, sc. i
The Spanish Tragedy (1592)

“President Donald Trump’s own words helped inspire the worst act of antisemitic violence in American history.”

Bernie Sanders (1941) American politician, senator for Vermont

2010s, 2019, November 2019

“Every ideology and mode of belief can, if true, implement itself by using the resources of technology and above all those of the media without having to resort to violence. In other words, violence has become unnecessary. In fact things have got to the point where violence cannot be afforded.”

Abdullah Öcalan (1949) Founder of the PKK

Translation of his defense testimony at his 1999 trial http://web.archive.org/20020203190623/www.geocities.com/kurdifi/ocelan.html.
Context: Every ideology and mode of belief can, if true, implement itself by using the resources of technology and above all those of the media without having to resort to violence. In other words, violence has become unnecessary. In fact things have got to the point where violence cannot be afforded. The rich variety of institutions and practices the democratic system offers is built on this social and scientific-technological development, and whatever problem it tackles, it offers a certain solution. It itself is the solution.
To go through the examples, the solution to religious wars is secularism. Here the standard and the implementation involve taking the approach that everyone is free to follow their religious beliefs and democratic criteria will apply to all of them. Democracy offers definite freedom of belief and this is the antidote to religious wars.
Again the same applies to the fields of thought and ideology. There is freedom of thought and conviction. It is allowed to work as one wants and implement one's beliefs as long as one does not infringe the rights of others in this respect. This also applies to political ideas and their expression in the form of parties. As long as it adheres to the democratic system and its state structure, every party can offer a solution without resorting to violence. There is no question here of either imposing a religion by force or breaking and shattering the structure of the state. Religion, thought and the parties based on them know to meet the standards of the democratic system of the state because they are based on them. If they don't know how to do this, then democracy gets the right to defend itself.
It is clear here that regardless of the social group they are based on (which might be a nation or an ethnic or religious group), beliefs, ideas and the parties through which they are expressed cannot, in the name of these beliefs and ideas, force the limits on which the state is based. There is no need for this, because it will render the problem they claim to be solving even worse. Consequently, there is no need for it, and, in any case, there are solutions within the system. These are the democratic rights of those groups. They are their freedoms of belief and thought. They are the parties. They are all types of coalitions. In the area of language and culture, the democratic solution is even more striking. This is the area where the greatest successes have been achieved. Because the intermingling of language and culture, these values that many national groups have assimilated together for centuries, do not want to separate and get weak and monotonous, but prefer to stay together to get enriched and achieve variety, strength and life. And the school and laboratory for this is democracy and its implementation with conviction.
Democracy is almost a garden of language and culture. The most developed and powerful principles of our day once again express this clearly. All European countries and North America are clear proofs of it. The attempt to suppress new religious, linguistic, cultural, intellectual and political developments during past centuries was the cause of all major wars, and resistance against suppression gave to wars which could be seen as understandable. Particularly in European countries this experience led to the development of a determined democracy in the wake of all these wars and led to the supremacy of the West. Western civilisation can, in this sense, be termed democratic civilisation. The democratic system is at least as important as scientific and technological superiority. Feeding off each other, they both became strong and achieved the status of world civilisation.

“It is of the nature of all internecine violence that it lives on hope. Violence feeds upon the hope of success … violence will not continue indefinitely where the objects which it proposes to itself appear to be unattainable, or at any rate unattainable within a predictable future. The Government in Northern Ireland and the Government in this country actually assist violence and strengthen it in so far as they appear to act and appear to reform under the pressure of violence… [The Government should ensure that] neither by word nor deed do we treat the membership of the Six Counties in the United Kingdom as negotiable. Every word or act which holds out the prospect that their unity with the rest of the United Kingdom might be negotiable is itself, consciously or unconsciously, a contributory cause to the continuation of violence in Northern Ireland.”

Enoch Powell (1912–1998) British politician

Speech http://hansard.millbanksystems.com/commons/1970/apr/07/northern-ireland-1#S5CV0799P0_19700407_HOC_336 in the House of Commons (7 April 1970)
1970s