I am reading this book, Gödel's Proof, by James R. Newman, at location 117 (Kindle), it says,
For various reasons, this axiom, (through a point outside a given line only one parallel to the line can be drawn), did not appear "self-evident" to the ancients.
Any idea what the various reasons might be? It's self-evident enough to me.
Edit
Sorry, my bad, right after the sentence, (the above quote), there is a footnote, says that:
The chief reason for this alleged lack of self-evidence seems to have been the fact that the parallel axiom makes an assertion about infinitely remote regions of space. Euclid defines parallel lines as straight lines in a plane that, "being produced indefinitely in both directions," do not meet. Accordingly, to say that two lines are parallel is to make the claim that the two lines will not meet even "at infinity." But the ancients were familiar with lines that, though they do not intersect each other in any finite region of the plane, do meet "at infinity." Such lines are said to be "asymptotic." Thus, a hyperbola is asymptotic to its axes. It was therefore not intuitively evident to the ancient geometers that from a point outside a given straight line only one straight line can be drawn that will not meet the given line even at infinity.
Best Answer
I think that it is not correct to say that "ancient hate the parallel postulate".
For sure, it is not so "self-evident" as others [but please, think at Common notion n°5 : "The whole is greater than the part"; until Cantor it was "absolutely" self-evident].
The possible explanation, as per Gerry's comment, is that it involves the infinite, and the infinite is not so easy to manage ...
According to Boris Rosenfeld, A History of Non-euclidean Geometry (original ed.1976), page 36, Euclid was "aware" of this :
According to Rosenfeld [page 40] :
The title of this work in known only through the list of Archimedes' works by ibn al-Nadim (ca.990), and
Added
As finely remarked by mau, the original definition and postulate are [see Thomas Heath, The Thirteen Books of Euclid's Elements . Volume 1 : Introduction & Books I and II (1908 - Dover reprint) ] :
Heath's edition comments at lenght definitions and postulates: the comment to P5 span from page 202 to page 220, with a lot of informations about the recorded attempt to prove it, from Proclus on.
Page 220 lists the most common alternatives to Euclid's version of the postulate; among them :