“There are two aspects of individual harmony: the harmony between body and soul, and the harmony between individuals. All the tragedy in the world, in the individual and in the multitude, comes from lack of harmony. And harmony is the best given by producing harmony in one's own life.”

St. 1.
A Song for St. Cecilia's Day http://www.englishverse.com/poems/a_song_for_st_cecilias_day_1687 (1687)
Context: From harmony, from heavenly harmony,
This universal frame began:
When nature underneath a heap
Of jarring atoms lay,
And could not heave her head,
The tuneful voice was heard from high,
'Arise, ye more than dead!'
Then cold, and hot, and moist, and dry,
In order to their stations leap,
And Music's power obey.
From harmony, from heavenly harmony,
This universal frame began:
From harmony to harmony
Through all the compass of the notes it ran,
The diapason closing full in Man.

The Birth of New India: A Collection of Writings and Speeches on Indian Affairs http://books.google.co.in/books?id=n7ZMF8Mjh2oC, p. 85

Small Houses: Their Economic Design and Construction (1922)

Source: The Art of the Dance (1928), p. 78.
Context: The harmony of music exists equally with the harmony of movement in nature.
Man has not invented the harmony of music. It is one of the underlying principles of life. Neither could the harmony of movement be invented: it is essential to draw one’s conception of it from Nature herself, and to see the rhythm of human movement from the rhythm of water in motion, from the blowing of the winds on the world, in all the earth’s movements, in the motions of animals, fish, birds, reptiles, and even in primitive man, whose body still moved in harmony with nature….. All the movements of the earth follow the lines of wave motion. Both sound and light travel in waves. The motion of water, winds, trees and plants progresses in waves. The flight of a bird and the movements of all animals follow lines like undulating waves. If then one seeks a point of physical beginning for the movement of the human body, there is a clue in the undulating motion of the wave.

Original: L'armonia rende e mantiene amore ed unione tra due persone.
Source: prevale.net

The Fabric of Mind (1985)

Treaty with the bey of Tunis https://web.archive.org/web/20150712204904/http://iipdigital.usembassy.gov/st/english/publication/2013/11/20131104285694.html#axzz3sjER1BV1 (1797).
1790s

pg 51.
Science in a Free Society (1978)

Source: A Sand County Almanac, 1949, "The Land Ethic", p. 207.