“The balanced relation is the purest representation of universality, of the harmony and unity which are inherent characteristics of the mind.”

Volume II, chapter V, section 30.
Source: The Stones of Venice (1853)

Literary and Historical Miscellanies (1855), The Necessity, the Reality, and the Promise of the Progress of the Human Race (1854)
Context: The unchanging character of law is the only basis on which continuous action can rest. Without it man would be but as the traveller over endless morasses; the builder on quicksands; the mariner without compass or rudder, driven successively whithersoever changing winds may blow. The universe is the reflex and image of its Creator. "The true work of art," says Michael Angelo, "is but a shadow of the Divine perfections." We may say in a more general manner, that Beauty Itself Is But The Sensible Image Of The Infinite; that all creation is a manifestation of the Almighty; not the result of caprice, but the glorious display of his perfection; and as the universe thus produced, is always in the course of change, so its regulating mind is a living Providence, perpetually exerting itself anew. If his designs could be thwarted, we should lose the great evidence of his unity, as well as the anchor of our own hope.
Harmony is the characteristic of the intellectual system of the universe; and immutable laws of moral existence must pervade all time and all space, all ages and all worlds.

Source: Accepting the Universe (1920), p.108

Source: Principles of Management, 1960, p. 284 (6th ed. 1971)

Source: Autopoiesis and cognition: The realization of the living (1980), p. 137

Source: Autopoiesis and cognition: The realization of the living (1980), p. 137.

as quoted by Ilya Prigogine in his Autobiography http://nobelprize.org/nobel_prizes/chemistry/laureates/1977/prigogine-autobio.html given at the occasion of Prigogine's 1977 Nobel Prize in Chemistry.

The Voice of the Earth: An Exploration of Ecopsychology (2001)