Interesting Notes on Plagiarism

pla·gia·rism [pláyj* rìzz*m]
(plural pla·gia·risms)
n
1. stealing somebody’s work or idea: copying what somebody else has written or taking somebody’s else’s idea and trying to pass it off as original
2. something plagiarized: something copied from somebody else’s work, or somebody else’s idea that somebody presents as his or her own
And plagiarism, knowingly stealing someone else’s published work and presenting it without attribution as one’s own, is another unmistakably fraudulent act.
-Fraud in Science by Christopher King

Plagiarism has many advantages over the labor of creation. It is much easier to carry out and less hard work. You can finish twenty works of plagiarism in the time it takes to produce one creative work.
-Bernardo Atxaga (1951 – )
Basque writer.
Obabakoak (Margaret Jull Costa (tr.))

“Plagiarism is good, but I always give credit when I steal. Quotations from the leading journals have more weight than anything I could write over my own signature. I write general accounts with the mucilage brush, but reserve the right to comment editorially,” said Clement.
-Chapter V, The Flambeau Drill, Original Page 44, HEARTS OF GOLD by J. McHenry Jones

When you steal from one author, it’s plagiarism; if you steal from many, it’s research.
-Wilson Mizner (1876 – 1933)
U.S. playwright.

Another example of implicit memory in everyday life is unintentional plagiarism. That is, people can copy the ideas of others without being aware they are doing so. The most famous case involved British singer-songwriter George Harrison, formerly of the Beatles. Harrison was sued because his 1970 hit song “My Sweet Lord” sounded strikingly similar to “He’s So Fine,” a 1963 hit by The Chiffons. Harrison denied that he had intentionally copied the earlier song but admitted that he had heard it before writing “My Sweet Lord.” In 1976 a judge ruled against Harrison, concluding that the singer had been unconsciously influenced by his memory.
– Memory (psychology)

Now, is it plagiarism when you mention some lines directly to the author to emphasize the beauty of their creation? Isn’t it that plagiarism refers to stealing one’s creation and claiming it as one’s own? Was there claim as somebody’s own when one borrows a few lines to stress how something was crafted magnificently?
What if somebody has the same tract of ideas and was expressed with the same number of words and phrases and unknowingly wrote them? Will it be plagiarism?
The context of this fraudulent act called plagiarism is a delicate matter. To accuse someone of plagiarism straight away without contemplating if it is really a case of plagiarism is neglect and ignorance the same way an implicit plagiarist is charged of.
Could it be possible that everybody who writes is a plagiarist in one form or another?
Let the experts expound…