“To punish the guilty adequately exceeds the power of any civilised man; for the atrocities which have been committed are such as to be imagined and perpetrated only by demons sallying forth from the lowest depths of hell.”

Quotes, NYU Speech (2004)
Context: The soldiers who are accused of committing these atrocities are, of course, responsible for their own actions and if found guilty, must be severely and appropriately punished. But they are not the ones primarily responsible for the disgrace that has been brought upon the United States of America.
Private Lynndie England did not make the decision that the United States would not observe the Geneva Convention. Specialist Charles Graner was not the one who approved a policy of establishing an American Gulag of dark rooms with naked prisoners to be "stressed" and even — we must use the word — tortured — to force them to say things that legal procedures might not induce them to say.
These policies were designed and insisted upon by the Bush White House.

As quoted in A Dictionary of Thoughts : Being a Cyclopedia of Laconic Quotations from the Best Authors, Both Ancient and Modern (1891) edited by Tryon Edwards. p. 327.
1890s and attributed from posthumous publications

Sermon VII : Outward and Inward Morality
Meister Eckhart’s Sermons (1909)
Context: Grace is from God, and works in the depth of the soul whose powers it employs. It is a light which issues forth to do service under the guidance of the Spirit. The Divine Light permeates the soul, and lifts it above the turmoil of temporal things to rest in God. The soul cannot progress except with the light which God has given it as a nuptial gift; love works the likeness of God into the soul. The peace, freedom and blessedness of all souls consist in their abiding in God's will. Towards this union with God for which it is created the soul strives perpetually.

Source: Discipline and Punish (1977), Chapter Three, The Gentle Way in Punishment
Context: This, then, is how one must imagine the punitive city. At the crossroads, in the gardens, at the side of roads being repaired or bridges built, in workshops open to all, in the depths of mines that may be visited, will be hundreds of tiny theatres of punishment. Each crime will have its law; each criminal his punishment. It will be a visible punishment, a punishment that tells all, that explains, justifies itself, convicts: placards, different-coloured caps bearing inscriptions, posters, symbols, texts read or printed, tirelessly repeat the code. Scenery, perspectives, optical effects, trompe-l’œil sometimes magnify the scene, making it more fearful than it is, but also clearer. From where the public is sitting, it is possible to believe in the existence of certain cruelties which, in fact, do not take place. But the essential point, in all these real or magnified severities, is that they should all, according to a strict economy, teach a lesson: that each punishment should be a fable. And that, in counterpoint with all the direct examples of virtue, one may at each moment encounter, as a living spectacle, the misfortunes of vice. Around each of these moral ‘representations’, schoolchildren will gather with their masters and adults will learn what lessons to teach their offspring. The great terrifying ritual of the public execution gives way, day after day, street after street, to this serious theatre, with its multifarious and persuasive scenes. And popular memory will reproduce in rumour the austere discourse of the law. But perhaps it will be necessary, above these innumerable spectacles and narratives, to place the major sign of punishment for the most terrible of crimes: the keystone of the penal edifice.

Man darf nur alt werden, um milder zu sein; ich sehe keinen Fehler begehen, den ich nicht auch begangen hätte.
Maxim 240, trans. Stopp
Maxims and Reflections (1833)

A Journey to Sakhalin (1891)

Source: War Is a Force That Gives Us Meaning

Chap.IX: The Primitive and the Technical
The Revolt of the Masses (1929)