“If our powers of prediction, and so our knowledge of the future, become much greater, then, even if they are never complete, this may radically alter our view of what constitutes a person, an act, a choice; and eo ipso our language and our picture of the world.”

Five Essays on Liberty (2002), From Hope and Fear Set Free (1964)
Context: Knowledge increases autonomy both in the sense of Kant, and in that of Spinoza and his followers. I should like to ask once more: is all liberty just that? The advance of knowledge stops men from wasting their resources upon delusive projects. It has stopped us from burning witches or flogging lunatics or predicting the future by listening to oracles or looking at the entrails of animals or the flight of birds. It may yet render many institutions and decisions of the present – legal, political, moral, social – obsolete, by showing them to be as cruel and stupid and incompatible with the pursuit of justice or reason or happiness or truth as we now think the burning of widows or eating the flesh of an enemy to acquire skills. If our powers of prediction, and so our knowledge of the future, become much greater, then, even if they are never complete, this may radically alter our view of what constitutes a person, an act, a choice; and eo ipso our language and our picture of the world. This may make our conduct more rational, perhaps more tolerant, charitable, civilised, it may improve it in many ways, but will it increase the area of free choice? For individuals or groups?