“Do not reveal, if liberty is precious to you; my face is the prison of love.”
The Notebooks of Leonardo da Vinci (1883), XXI Letters. Personal Records. Dated Notes.
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Leonardo Da Vinci 363
Italian Renaissance polymath 1452–1519Related quotes

“It is true that liberty is precious — so precious that it must be rationed.”
As quoted in Soviet Communism: A New Civilization? (1936) by Sidney & Beatrice Webb
Attributions
Looking up the reference, the book that is cited is not even quoting him. The quote's origins are the book Soviet Communism: A New Civilisation by Sidney and Beatrice Webb. However, the books states that "...Lenin is said to have once observed that..." so clearly the authors are not quoting directly. The quote really just sounds like the kind of thing an anti-communist dreams.

Google this: Jean Vanier and what it means to be human http://www.huffingtonpost.com/david-briggs/google-this-jean-vanier-a_b_7484702.html Huffington Post, 02/06/2015
From interviews and talks

“Nothing is more precious than Independence and Liberty.”
Political slogan, quoted in Ho Chi Minh and His Vietnam : A Personal Memoir (1972) by Jean Sainteny, p. 172
Variant translation: Nothing is more valuable than freedom and independence.
World Marxist Review: Problems of Peace and Socialism (1979), p. 91

“Your face is my heart Sassenach, and the love of you is my soul”
Variant: Your face is my heart
Source: Drums of Autumn

“649. A beane in liberty is better than a comfit in prison.”
Jacula Prudentum (1651)

“Hypothetical liberty is allowed to everyone who is not a prisoner and in chains”
§ 8.23
An Enquiry Concerning Human Understanding (1748)