“Happiness cannot be pursued; it must ensue.”

Travaillons enfin pour le bonheur du peuple, et que les legislateurs qui doivent éclairer le monde prennent leur course d'un pied hardi, comme le soleil.
Speech to the National Convention (December 27, 1792). [Source: Oeuvres Complètes de Saint-Just, Vol. 1 (2 vols., Paris, 1908), p. 383]

"Italy", Ch. 18, p. 182
Source: Report to Greco (1965)

Kaoru Ishikawa, as cited in: Howard S Gitlow (2000), Quality Management Systems: A Practical Guide. p. 3

Source: Skipping Towards Gomorrah: The Seven Deadly Sins and the Pursuit of Happiness in America

Article 1
Virginia Declaration of Rights (1776)

Divan 1740:1-3, as translated by Fatemeh Keshavarz in Reading Mystical Lyric : The Case of Jalal al-Din Rumi (1998)

Abide as the Self

"The Science to Save Us from Science," The New York Times Magazine (19 March 1950)
1950s
Context: All who are not lunatics are agreed about certain things. That it is better to be alive than dead, better to be adequately fed than starved, better to be free than a slave. Many people desire those things only for themselves and their friends; they are quite content that their enemies should suffer. These people can only be refuted by science: Humankind has become so much one family that we cannot ensure our own prosperity except by ensuring that of everyone else. If you wish to be happy yourself, you must resign yourself to seeing others also happy.