„If the earth were not round, heavy bodies would not tend from every side in a straight line towards the center of the earth, but to different points from different sides.“

„Proposition 14. The straight line joined from the centre of the earth to the centre of the moon has to the straight line cut off from the axis towards the centre of the moon by the straight line subtending the (circumference) within the earth's shadow a ratio greater than that which 675 has to 1.“

—  Aristarchus of Samos ancient Greek astronomer and mathematician

p, 125
On the Sizes and Distances of the Sun and the Moon (c. 250 BC)

„There are three sides to every story: your side, my side, and the truth. And no one is lying. Memories shared serve each differently.“

—  Robert Evans

[Robert Evans, 2002, http://www.imdb.com/title/tt0303353, The Kid Stays in the Picture, Documentary, Highway Films]
The unreliable narrator

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

—  Archimedes, buch On the Equilibrium of Planes

Book 1, Proposition 13.
On the Equilibrium of Planes

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

—  Archimedes, buch On the Equilibrium of Planes

Book 1, Proposition 9.
On the Equilibrium of Planes

„…wheresoever the earth may be placed, or whithersoever it may be carried by its animal faculty, heavy bodies will always be carried towards it.“

—  Johannes Kepler, buch Astronomia nova

As quoted by Bryant, ibid., p. 36
Astronomia nova (1609)

„Our earth is round, and, among other things, that means that you and I can hold completely different points of view and both be right. The difference of our positions will show stars in your window I cannot even imagine.“

—  June Jordan Poet, essayist, playwright, feminist and bisexual activist 1936 - 2002

Introduction to the "Corners on the Curving Sky" section of the book Soulscript (1970) compiled by Jordan. These lines have been widely published in verse format as work misattributed to Gwendolyn Brooks, usually as a poem titled "Corners on the Curving Sky." One website http://web.archive.org/20090809112040/www.geocities.com/juscurious/anon.html indicated that Brooks had publicly repudiated the attribution of these lines to her, but the misattribution seems to have long remained largely unrecognized.
Kontext: Our earth is round, and, among other things, that means that you and I can hold completely different points of view and both be right. The difference of our positions will show stars in your window I cannot even imagine. Your sky may burn with light, while mine, at the same moment, spreads beautiful to darkness. Still we must choose how we separately corner the circling universe of our experience. Once chosen, our cornering will determine the message of any star and darkness we encounter. These poems speak to philosophy; they reveal the corners where we organize what we know.

„Our earth is round, and, among other things
That means that you and I can hold completely different
Points of view and both be right.
The difference of our positions will show
Stars in your window I cannot even imagine.“

—  Gwendolyn Brooks American writer 1917 - 2000

The above statements have been widely published in the above format as lines of verse attributed to Brooks, usually as a poem titled "Corners on the Curving Sky" — but one website http://web.archive.org/20090809112040/www.geocities.com/juscurious/anon.html indicated that she declared she did not write them. The words actually occur as an introduction to the "Corners on the Curving Sky" section of the book Soulscript (1970) compiled by June Jordan, in which other poems of Brooks were included, and thus is apparently the work of Jordan. It appears simply in paragraph form and reads thus:
Misattributed, "Corners on the Curving Sky"
Kontext: Our earth is round, and, among other things
That means that you and I can hold completely different
Points of view and both be right.
The difference of our positions will show
Stars in your window I cannot even imagine.
Your sky may burn with light,
While mine, at the same moment,
Spreads beautiful to darkness.

„Alone of all the races on earth, they seem to be free from the 'Grass is Greener on the other side of the fence' syndrome, and roundly proclaim that Australia is, in fact, the other side of that fence.“

—  Douglas Adams English writer and humorist 1952 - 2001

„That somehow dreams are a blurred line between here and there, like a meeting room in a prison. You’re both in the same room, yet on different sides and really, in different worlds.“

—  Cecelia Ahern Irish novelist 1981

Quelle: The Book of Tomorrow

„Heaven and Earth are turning
Round the Earth fire is burning.
Sheltered from the cruel storm
Peace on Earth is new born“

—  Mike Oldfield English musician, multi-instrumentalist 1953

Song lyrics, The Millennium Bell (1999)

„Let both sides unite to heed in all corners of the earth the command of Isaiah — to "undo the heavy burdens … and to let the oppressed go free."“

—  John F. Kennedy 35th president of the United States of America 1917 - 1963

1961, Inaugural Address
Kontext: So let us begin anew — remembering on both sides that civility is not a sign of weakness, and sincerity is always subject to proof. Let us never negotiate out of fear. But let us never fear to negotiate.
Let both sides explore what problems unite us instead of belaboring those problems which divide us. [... ] Let both sides seek to invoke the wonders of science instead of its terrors. Together let us explore the stars, conquer the deserts, eradicate disease, tap the ocean depths, and encourage the arts and commerce.
Let both sides unite to heed in all corners of the earth the command of Isaiah — to "undo the heavy burdens … and to let the oppressed go free."

„Of the bodies in the cosmos, some imitate mind and move in orbits; some imitate soul and move in a straight line, fire and air upward, earth and water downward.“

—  Sallustius Roman philosopher and writer

VII. On the Nature of the World and its Eternity.
On the Gods and the Cosmos

„One has to take several different shots of a subject, from different points of view and in different situations, as if one examined it in the round rather than looked through the same key-hole again and again.“

—  Alexander Rodchenko Russian artist and photographer 1891 - 1956

Quoted on Wikipedia:Rodchenko

„The good effects that emanate from the same source are equally diffused upon the earth. Different regions become partakers in these benefits in different ways“

—  Julian (emperor) Roman Emperor, philosopher and writer 331 - 363

Upon the Sovereign Sun (362)
Kontext: The good effects that emanate from the same source are equally diffused upon the earth. Different regions become partakers in these benefits in different ways; so that neither their production comes to an end, nor does the Deity confer his blessings upon the recipient world with any degree of variation. For where the substance is the same, so is the action thereof, in the case of Divine Powers; especially with him who is king of them all, namely, the Sun; of whom the motion is the most simple amongst all the bodies that move in a contrary direction to the world, which fact that most excellent philosopher, Aristotle, adduces to prove the superiority of that luminary to the others.

„At the round earth's imagin'd corners, blow
Your trumpets, angels, and arise, arise
From death, you numberless infinities
Of souls, and to your scattered bodies go.“

—  John Donne, buch Holy Sonnets

No. 7, line 1
Holy Sonnets (1633)

„The Aegean sea washes Greece on two sides: first, the side that faces towards the east and stretches from Sunium, towards the north as far as the Thermaean Gulf and Thessaloniceia, a Macedonian city…; and secondly, the side that faces towards the south, I mean the Macedonian country, extending from Thessaloniceia as far as the Strymon.“

—  Strabo, Geographica

7.7.4-5
Geographica, 7 BC

„The Christian's life on this side and beyond the grave is essentially the same, differing only as a song which, at a certain point, changes from the minor to the major key, and thenceforth wells along with still more glorious harmonies.“

—  John McClellan Holmes US Christian minister and author 1834 - 1911

Quelle: Dictionary of Burning Words of Brilliant Writers (1895), P. 118.

„Even if we come from different sides of the world, speak different languages. Even if we eat too many chips, or rice balls. Even if we have different tastes in games. Every one of us, here today, is identical, in the most important way. Each one of us has the heart of a gamer.“

—  Satoru Iwata Japanese video game programmer and businessman 1959 - 2015

2005 GDC Keynote https://www.youtube.com/watch?v=AnrEosZKzp4&t=8m6s

„But if some mind very different from ours were to look upon some property of some curved line as we do on the evenness of a straight line, he would not recognize as such the evenness of a straight line; nor would he arrange the elements of his geometry according to that very different system, and would investigate quite other relationships as I have suggested in my notes.
We fashion our geometry on the properties of a straight line because that seems to us to be the simplest of all. But really all lines that are continuous and of a uniform nature are just as simple as one another. Another kind of mind which might form an equally clear mental perception of some property of any one of these curves, as we do of the congruence of a straight line, might believe these curves to be the simplest of all, and from that property of these curves build up the elements of a very different geometry, referring all other curves to that one, just as we compare them to a straight line. Indeed, these minds, if they noticed and formed an extremely clear perception of some property of, say, the parabola, would not seek, as our geometers do, to rectify the parabola, they would endeavor, if one may coin the expression, to parabolify the straight line.“

—  Roger Joseph Boscovich Croat-Italian physicist 1711 - 1787

"Boscovich's mathematics", an article by J. F. Scott, in the book Roger Joseph Boscovich (1961) edited by Lancelot Law Whyte.
"Transient pressure analysis in composite reservoirs" (1982) by Raymond W. K. Tang and William E. Brigham.
"Non-Newtonian Calculus" (1972) by Michael Grossman and Robert Katz.