“So, march away; and let due praise be given
Neither to fate nor fortune, but to Heaven.”

Epistulae Morales ad Lucilium (Moral Letters to Lucilius), Letter LXIII

"From a Letter to the Rev. Mr. Newton", line 21. (1782).

His last message, carved onto the walls of his dungeon cell, as quoted in For Faith and Freedom (1997) by Charles A. Howe, p. 109 <!-- Skinner House Books, Boston; also quoted on their web page [LINK now DEAD 2016·03·01] about the Transylvania Unitarian Church (Archive 2007) https://web.archive.org/web/20070717180511/www.emersonhou.org/Transylvania.htm by the Emerson Unitarian Universalist Church, Houston -->
Context: Neither the sword of popes, nor the cross, nor the image of death — nothing will halt the march of truth. I wrote what I felt and that is what I preached with trusting spirit. I am convinced that after my destruction the teachings of false prophets will collapse.

Source: Reflections and Maxims (1746), p. 180.

Attributed in Henry Louis Mencken (1942), A New Dictionary of Quotations
Misattributed

I, p. 448
1810s, Letters to John Taylor (1814)
Context: Liberty, according to my metaphysics, is an intellectual quality; an attribute that belongs not to fate nor chance. Neither possesses it, neither is capable of it. There is nothing moral or immoral in the idea of it. The definition of it is a self-determining power in an intellectual agent. It implies thought and choice and power; it can elect between objects, indifferent in point of morality, neither morally good nor morally evil. If the substance in which this quality, attribute, adjective, call it what you will, exists, has a moral sense, a conscience, a moral faculty; if it can distinguish between moral good and moral evil, and has power to choose the former and refuse the latter, it can, if it will, choose the evil and reject the good, as we see in experience it very often does.

Epistulae Morales ad Lucilium (Moral Letters to Lucilius), Letter LIX: On Pleasure and Joy


Poetical Portrait III
The Venetian Bracelet (1829)

Magnam habet cordis tranquillitatem, qui nec laudes curat, nec vituperia. — Thomas à Kempis, Imitation of Christ (ca. 1418), book II, ch. VI, paragraph 2.
Misattributed