“I have never knew what it was to sacrifice my own judgment to gratify any party and I have no doubt of the time being close at hand when I will be rewarded for letting my tongue speak what my heart thinks. I have suffered myself to be politically sacrificed to save my country from ruin and disgrace and if I am never again elected I will have the gratification to know that I have done my duty.”
Comments on his final election defeat (11 August 1835) Ch. 2; in Dr. Swan's Prescriptions for Job-Itis (2003) by Dennis Swanberg and Criswell Freeman, p. 45, part of this seems to have become paraphrased as "Let your tongue speak what your heart thinks." No earlier publication of this version has been located.
Col. Crockett's Exploits and Adventures in Texas (1836)
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Davy Crockett 29
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Source: Girja Kumar The Book on Trial: Fundamentalism and Censorship in India http://books.google.co.in/books?id=n-KUICFfA00C&pg=PA460&dq=Devegowda&hl=en&sa=X&ei=bJe6U8othJWTBe2mgLAD&redir_esc=y#v=onepage&q=Devegowda&f=false, Har-Anand Publications, 01-Jan-1997

Dialogues on Metaphysics (1688) Dialogue III
Context: I am unable, when I turn to myself, to recognize any of my faculties or my capacities. The inner sensation which I have of myself informs me that I am, that I think, that I will, that I have sensory awareness, that I suffer, and so on; but it provides me with no knowledge whatever of what I am — of the nature of my thought, my sensations, my passions, or my pain — or the mutual relations that obtain between all these things … I have no idea whatever of my soul.

Letter to George Washington (July 1778)

Diary entry (1 April 1920).
The Diary and Letters of Käthe Kollwitz (1955)