“To sow, that others may reap; to work and plant for those that are to occupy the earth when we are dead; to project our influences far into the future, and live beyond our time; to rule as the Kings of Thought, over men who are yet unborn; to bless with the glorious gifts of Truth and Light and Liberty those who will neither know the name of the giver, nor care in what grave his unregarded ashes repose, is the true office of a Mason and the proudest destiny of a man.”

The trial of Charles B. Reynolds for blasphemy (1887)
Context: The question to be tried by you is whether a man has the right to express his honest thought; and for that reason there can be no case of greater importance submitted to a jury. And it may be well enough for me, at the outset, to admit that there could be no case in which I could take a greater — a deeper interest. For my part, I would not wish to live in a world where I could not express my honest opinions. Men who deny to others the right of speech are not fit to live with honest men.
I deny the right of any man, of any number of men, of any church, of any State, to put a padlock on the lips — to make the tongue a convict. I passionately deny the right of the Herod of authority to kill the children of the brain.
A man has a right to work with his hands, to plow the earth, to sow the seed, and that man has a right to reap the harvest. If we have not that right, then all are slaves except those who take these rights from their fellow-men.

Virginia high school appearance, February 28, 2000. http://renewamerica.us/archives/speeches/00_02_28virginia.htm.
2000

Vol. 1, Chap. 71.
The Decline And Fall Of The Roman Empire: Volume 1 (1776)

Source: The 7 Habits of Highly Effective People

Source: Meditations

A History of the Lyre
The Venetian Bracelet (1829)

Saying published anonymously in The Dayspring, Vol. 10 (1881) by the Unitarian Sunday-School Society, and quoted in Life and Labor (1887) by Smiles; this is most often attributed to George Dana Boardman, at least as early as 1884, but also sometimes attributed to William Makepeace Thackeray as early as 1891, probably because in in Life and Labor Smiles adds a quote by Thackeray right after this one, to Charles Reade in 1903, and to William James as early as 1906, because it appears in his Principles of Psychology (1890).
Misattributed
Source: Happy Homes and the Hearts That Make Them

Preface 7
Human, All Too Human (1878)