“Sometimes Satan comes as a man of peace.”

Vol. I, The Way of Illumination Section I - The Way of Illumination, Part III : The Sufi http://wahiduddin.net/mv2/I/I_I_3.htm
The Spiritual Message of Hazrat Inayat Khan
Context: What is the Sufi's belief regarding the coming of a World Teacher, or, as some speak if it, the "Second Coming of Christ?" The Sufi is free from beliefs and disbeliefs, and yet gives every liberty to people to have their own opinion. There is no doubt that if an individual or a multitude believe that a teacher or a reformer will come, he will surely come to them. Similarly, in the case of those who do not believe that any teacher or reformer will come, to them he will not come. To those who expect the Teacher to be a man, a man will bring the message; to those who expect the Teacher to be a woman, a woman must deliver it. To those who call on God, God comes. To those who knock at the door of Satan, Satan answers. There is an answer to every call. To a Sufi the Teacher is never absent, whether he comes in one form or in a thousand forms he is always one to him, and the same One he recognizes to be in all, and all Teachers he sees in his one Teacher alone. For a Sufi, the self within, the self without, the kingdom of the earth, the kingdom of heaven, the whole being is his teacher, and his every moment is engaged in acquiring knowledge. For some, the Teacher has already come and gone, for others the Teacher may still come, but for a Sufi the Teacher has always been and will remain with him forever.

" Peace http://www.bartleby.com/122/22.html", lines 3-6
Wessex Poems and Other Verses (1918)

Letter to Deborah Hatheway (1741), in Letters and Personal Writings (1998), edited by George S. Claghorn, Vol. 16.

3552
Table Talk (1569)

A Meditation on the Coming of Christ to Judgment, And of the Reward Both of the Faithful and Un-Faithful.
Sermon on Repentence

Il y a dans tout homme, à toute heure, deux postulations simultanées, l'une vers Dieu, l'autre vers Satan.
Journaux intimes (1864–1867; published 1887), Mon cœur mis à nu (1864)

Speech to the Labour conference in Blackpool, 2 October 2002. Perhaps echoes an old latin proverb, Si vis pacem, para bellum (If you want peace, be prepared for war).
2000s

De Generatione Animalium (1651)
Context: Man comes into the world naked and unarmed, as if nature had destined him for a social creature, and ordained him to live under equitable laws and in peace; as if she had desired that he should be guided by reason rather than be driven by force; therefore did she endow him with understanding, and furnish him with hands, that he might himself contrive what was necessary to his clothing and protection. To those animals to which nature has given vast strength, she has also presented weapons in harmony with their powers; to those that are not thus vigorous, she has given ingenuity, cunning, and singular dexterity in avoiding injury.

Songs of the Soul (1971)