„The centre of gravity of a parallelogram is the point of intersection of its diagonals.“

—  Arquímedes, livro On the Equilibrium of Planes, On the Equilibrium of Planes, Book 1, Proposition 10.
-287 - -212 a.C.

„The centre of gravity of any parallelogram lies on the straight line joining the middle points of opposite sides.“

—  Archimedes, livro On the Equilibrium of Planes
On the Equilibrium of Planes, Book 1, Proposition 9.

„If two equal weights have not the same centre of gravity, the centre of gravity of both taken together is at the middle point of the line joining their centres of gravity.“

—  Archimedes, livro On the Equilibrium of Planes
On the Equilibrium of Planes, Book 1, Proposition 4.

„The centre of gravity of any cylinder is the point of bisection of the axis.“

—  Archimedes, livro The Method of Mechanical Theorems
The Method of Mechanical Theorems, Proposition presumed from previous work.

„It follows at once from the last proposition that the centre of gravity of any triangle is at the intersection of the lines drawn from any two angles to the middle points of the opposite sides respectively.“

—  Archimedes, livro On the Equilibrium of Planes
On the Equilibrium of Planes, Book 1, Proposition 14.

„The centre of gravity of any cone is [the point which divides its axis so that] the portion [adjacent to the vertex is] triple“

—  Archimedes, livro The Method of Mechanical Theorems
The Method of Mechanical Theorems, of the portion adjacent to the base Proposition presumed from previous work.

„In any triangle the centre of gravity lies on the straight line joining any angle to the middle point of the opposite side.“

—  Archimedes, livro On the Equilibrium of Planes
On the Equilibrium of Planes, Book 1, Proposition 13.

„Opinion is like a pendulum and obeys the same law. If it goes past the centre of gravity on one side, it must go a like distance on the other; and it is only after a certain time that it finds the true point at which it can remain at rest.“

—  Arthur Schopenhauer, livro Parerga e Paralipomena
Parerga and Paralipomena (1851), Counsels and Maxims, Vol. 2 "Further Psychological Observations" as translated in Essays and Aphorisms (1970), as translated by R. J. Hollingdale

„Grasping spatial gestalts as figures is mathematizing of space. Arranging the properties of a parallelogram such that a particular one pops up to base the others on it in order to arrive at a definition of parallelogram, that is mathematizing the conceptual field of the parallelogram.“

—  Hans Freudenthal Dutch mathematician 1905 - 1990
Mathematics as an Educational Task (1973), p. 133

„The centre of gravity of any hemisphere [is on the straight line which] is its axis, and divides the said straight line in such a way that the portion of it adjacent to the surface of the hemisphere has to the remaining portion the ratio which 5 has to 3.“

—  Archimedes, livro The Method of Mechanical Theorems
The Method of Mechanical Theorems, Proposition 6.

„In its most general form and from the point of view of physics, love is the internal, affectively apprehended, aspect of the affinity which links and draws together the elements of the world, centre to centre.“

—  Pierre Teilhard De Chardin French philosopher and Jesuit priest 1881 - 1955
Activation of Energy (1976), This is how it has been understood by the great philosophers from Plato, the poet, to Nicolas of Cusa and other representatives of frigid scholasticism. Once this definition has been accepted, it gives rise to a series of important consequences. Love is power of producing inter-centric relationship. It is present, therefore (at least in a rudimentary state), in all the natural centres, living and pre-living, which make up the world; and it represents, too, the most profound, most direct, and most creative form of inter-action that it is possible to conceive between those centres. Love, in fact, is the expression and the agent of universal synthesis. pp. 70–71 https://archive.org/stream/ActivationOfEnergy/Activation_of_Energy#page/n65/mode/2up

„They say gravity is the centre of attraction; I rather think that noise is. Nothing so soon assembles the inhabitants of a house as a loud and sudden noise : …“

—  Letitia Elizabeth Landon English poet and novelist 1802 - 1838
Heath's book of Beauty, 1833 (1832)

„The earth is not in the centre of the Sun's orbit nor at the centre of the universe, but in the centre of its companion elements, and united with them.“

—  Leonardo Da Vinci Italian Renaissance polymath 1452 - 1519
XV Astronomy, Context: The earth is not in the centre of the Sun's orbit nor at the centre of the universe, but in the centre of its companion elements, and united with them. And any one standing on the moon, when it and the sun are both beneath us, would see this our earth and the element of water upon it just as we see the moon, and the earth would light it as it lights us.

„If we are a metaphor of the universe, the human couple is the metaphor par excellence, the point of intersection of all forces and the seed of all forms.“

—  Octavio Paz, Alternating Current
Alternating Current (1967), Context: If we are a metaphor of the universe, the human couple is the metaphor par excellence, the point of intersection of all forces and the seed of all forms. The couple is time recaptured, the return to the time before time. André Breton or the Quest of the Beginning

„I am an individual … a circle touching and intersecting my neighbours at certain points, but nowhere corresponding, nowhere blending.“

—  Richard Francis Burton British explorer, geographer, translator, writer, soldier, orientalist, cartographer, ethnologist, spy, linguist, poet,… 1821 - 1890
The Kasîdah of Hâjî Abdû El-Yezdî (1870), Note I : Hâjî Abdû, The Man, Context: I am an individual … a circle touching and intersecting my neighbours at certain points, but nowhere corresponding, nowhere blending. Physically I am not identical in all points with other men. Morally I differ from them: in nothing do the approaches of knowledge, my five organs of sense (with their Shelleyan "interpenetration"), exactly resemble those of any other being. Ergo, the effect of the world, of life, of natural objects, will not in my case be the same as with the beings most resembling me. Thus I claim the right of creating or modifying for my own and private use, the system which most imports me; and if the reasonable leave be refused to me, I take it without leave. But my individuality, however all-sufficient for myself, is an infinitesimal point, an atom subject in all things to the Law of Storms called Life. I feel, I know that Fate is. But I cannot know what is or what is not fated to befall me. Therefore in the pursuit of perfection as an individual lies my highest, and indeed my only duty, the "I" being duly blended with the "We." I object to be a "self-less man," which to me denotes an inverted moral sense. I am bound to take careful thought concerning the consequences of every word and deed. When, however, the Future has become the Past, it would be the merest vanity for me to grieve or to repent over that which was decreed by universal Law.

„the gravity of a substance depends not on the amount of its weight, but on its nature.“

—  Vitruvius, livro De architectura
De architectura (The Ten Books On Architecture) (~ 15BC), Book VII, Chapter VIII, Sec. 3