“Freedom and not peace, is essential when it comes on learning new concepts. We learn best by having fun. In enjoyment, rather than being under total surveillance.”

As quoted in "Kohl: German chancellor, European statesman" https://www.dw.com/en/kohl-german-chancellor-european-statesman/a-16274982 (October 1, 2012), Deutsche Welle

Quote translated from his German book: Wer bin ich – und wenn ja, wie viele? Eine philosophische Reise, Goldmann, München 2007, ISBN 3-442-31143-8

1990s and beyond, The Book of Probes : Marshall McLuhan (2011)

Source: My Life in France

Source: The Divine Conspiracy: Rediscovering Our Hidden Life In God

Introduction, Beast and Man: The Roots of Human Nature (1979).
Context: The notion that we "have a nature" far from threatening the concept of freedom, is absolutely essential to it. If we were genuinely plastic and indeterminate at birth, there could be no reason why society should not stamp us into any shape that might suit it. The reason people view suggestions about inborn tendencies with such indiscriminate horror seems to be that they think exclusively in one particular way in which the idea of such tendencies has been misused, namely, that where conservative theorists invoke them uncritically to resist reform. But liberal theorists who combat such resistance need them just as much, and indeed, usually more. The early architects of our current notion of freedom made human nature their cornerstone. Rousseau's trumpet call "Man is born free, but everywhere he is in chains," makes sense only as description of our innate constitution as something positive, already determined, and conflicting with what society does to us. Kant and Mill took similar positions. And Marx, though he officially dropped the notion of human nature and attacked the term, relied on the idea as much as anybody else for his crucial notion of Dehumanization.

LOVE (1972)

Source: Strength to Love