„Thus, all unknown quantities can be expressed in terms of a single quantity, whenever the problem can be constructed by means of circles and straight lines, or by conic sections, or even by some other curve of degree not greater than the third or fourth.
But I shall not stop to explain this in more detail, because I should deprive you of the pleasure of mastering it yourself, as well as of the advantage of training your mind by working over it, which is in my opinion the principal benefit to be derived from this science. Because, I find nothing here so difficult that it cannot be worked out by anyone at all familiar with ordinary geometry and with algebra, who will consider carefully all that is set forth in this treatise.“

First Book
La Géométrie (1637)

Adopted from Wikiquote. Last update June 3, 2021. History
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René Descartes45
French philosopher, mathematician, and scientist 1596 - 1650

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„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.

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„By fight I mean arm yourself with all the available information, get second opinions, third opinions, and fourth opinions.“

—  Lance Armstrong, book It's Not About the Bike: My Journey Back to Life

Source: It's Not About the Bike: My Journey Back to Life (2000), p. 267
Context: Anything is possible. You can be told you have a 90-percent chance or a 50-percent chance or a 1-percent chance, but you have to believe, and you have to fight. By fight I mean arm yourself with all the available information, get second opinions, third opinions, and fourth opinions. Understand what has invaded your body, and what the possible cures are. It's another fact of cancer that the more informed and empowered patient has a better chance of long-term survival. What if I had lost? What if I relapsed and the cancer came back? I still believe I would have gained something in the struggle, because in what time I had left I would have been a more complete, compassionate, and intelligent man, and therefore more alive.

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