|A Jun 1776 draft copy of The Declaration of Independence, by Thomas Jefferson, wherein the phrase: “life, liberty, and property” is changed to “life, liberty and the pursuit of happiness” as the three unalienable rights of humans.|
“Believe me, dear Sir: there is not in the British empire a man who more cordially loves a union with Great Britain than I do. But, by the God that made me, I will cease to exist before I yield to a connection on such terms as the British Parliament propose; and in this, I think I speak the sentiments of America.”
This change, baring prolonged discussion, may have reflected certain aspects of Jefferson's Epicurean belief system.
See main: Ostwald happiness formulaIn 1905, German physical chemist Wilhelm Ostwald penned a happiness equation based on his energetics theories.  Ostwald's happiness equation reads as follows:
See main: Porteus' theory of happinessIn 1987, American philosopher Elizabeth Porteus, daughter of the James Dole the “Pineapple King” of Hawaii, her My Twentieth Century Philosophy, discuss a connection between thermodynamics, happiness, and impulses.
“We see many who are struggling against adversity who are happy, and more although abounding in wealth, who are wretched.”— Publius Tacitus (c.100)