If one had to define one ...

If one had to define one essential gift with which a dancer needs to be endowed, there might be a rush of answers. A beautiful body, grace of line, graciousness of spirit, joy in the work, ability to please, unswerving integrity, relentless ambition towards some abstract perfection. Certainly all these factors determine a dancer's character, and every element exists in some combination within the performing artist's presence.
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 Lincoln Kirstein

Quotes from the same author

Ballet dancers are a self-chosen elite. To survive and surmount years of disciplinary preparation and seasons of even more arduous performance requires rigid determination and almost mindless self-abnegation. One other factor is difficult to predetermine: without a certain admixture of hysteria - sometimes masking as self-obsession, sometimes even counterfeiting incipient madness - performers, at once acrobats, artists, and animals, make little public impression.
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 Lincoln Kirstein
In liberal democracy and anxious anarchy, the traditional classic dance, compact of aristocratic authority and absolute freedom in a necessity of order, has never been so promising as an independent expression as it is today.
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 Lincoln Kirstein
While photography to Cartier-Bresson is constantly an intuitive process, it is never purely instinctive. It is founded on continuous intellection, on ceaseless consideration during all moments previous to, or preparatory for, the pressing. It does not only operate in the blinding flash of a moment seized; it works all the time. The snatched picture merely cuts across the vein of observable incident or accident which is always beating, whether or not the fingers actually press.
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 Lincoln Kirstein