“I invite even the school of violence to give this peaceful non-co-operation a trial. It will not fail through its inherent weakness. It may fail because of poverty of response. Then will be one time for real danger. The high-souled men, who are unable to suffer national humiliation any longer, will want to vent their wrath. They will take to violence.”

1990s, Nobel Prize acceptance speech (1993)
Context: Together, we join two distinguished South Africans, the late Chief Albert Lutuli and His Grace Archbishop Desmond Tutu, to whose seminal contributions to the peaceful struggle against the evil system of apartheid you paid well-deserved tribute by awarding them the Nobel Peace Prize. It will not be presumptuous of us if we also add, among our predecessors, the name of another outstanding Nobel Peace Prize winner, the late Rev Martin Luther King Jr. He, too, grappled with and died in the effort to make a contribution to the just solution of the same great issues of the day which we have had to face as South Africans. We speak here of the challenge of the dichotomies of war and peace, violence and non-violence, racism and human dignity, oppression and repression and liberty and human rights, poverty and freedom from want.

Letter from Landauer to Martin Buber 1901, quoted in Martin Buber's Life and Work, vol. I by M. Friedman 1981, p. 251

As quoted in "AK-47 Inventor Says Conscience Is Clear" by Joel Roberts at CBS News (6 July 2007) https://www.cbsnews.com/news/ak-47-inventor-says-conscience-is-clear/

1920s, The Doctrine Of The Sword (1920)
Context: In this age of the rule of brute force, it is almost impossible for anyone to believe that anyone else could possibly reject the law of final supremacy of brute force. And so I receive anonymous letters advising me that I must not interfere with the progress of non-co-operation even though popular violence may break out. Others come to me and assuming that secretly I must be plotting violence, inquire when the happy moment for declaring open violence to arrive. They assure me that English never yield to anything but violence secret or open. Yet others I am informed, believe that I am the most rascally person living in India because I never give out my real intention and that they have not a shadow of a doubt that I believe in violence just as much as most people do.
Such being the hold that the doctrine of the sword has on the majority of mankind, and as success of non-co-operation depends principally on absence of violence during its pendency and as my views in this matter affect the conduct of large number of people. I am anxious to state them as clearly as possible.
I do believe that where there is only a choice between cowardice and violence I would advise violence.

Summations, Chapter 48
Context: Our good Lord the Holy Ghost, which is endless life dwelling in our soul, full securely keepeth us; and worketh therein a peace and bringeth it to ease by grace, and accordeth it to God and maketh it pliant. And this is the mercy and the way that our Lord continually leadeth us in as long as we be here in this life which is changeable.
For I saw no wrath but on man’s part; and that forgiveth He in us. For wrath is not else but a forwardness and a contrariness to peace and love; and either it cometh of failing of might, or of failing of wisdom, or of failing of goodness: which failing is not in God, but is on our part. For we by sin and wretchedness have in us a wretched and continuant contrariness to peace and to love. And that shewed He full often in His lovely Regard of Ruth and Pity. For the ground of mercy is love, and the working of mercy is our keeping in love. And this was shewed in such manner that I could not have perceived of the part of mercy but as it were alone in love; that is to say, as to my sight.

As quoted in The Sikh Review, Vol. 55 (2007), p. 173
Context: Non-violence is backed by the theory of soul-force in which suffering is courted in the hope of ultimately winning over the opponent. But what happens when such an attempt fail to achieve the object? It is here that soul-force has to be combined with physical force so as not to remain at the mercy of tyrannical and ruthless enemy.

Source: A Distant Mirror (1978), p. 273