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Kierkegaard wrote:

"With infinite resignation he has drained the cup of life's profound sadness, he knows the bliss of the infinite, he senses the pain of renouncing everything, the dearest things he possesses in the world, and yet finiteness tastes to him just as good as to one who never knew anything higher, for his continuance in the finite did not bear a trace of the cowed and fearful spirit produced by the process of training; and yet he has this sense of security in enjoying it, as though the finite life were the surest thing of all. And yet, and yet the whole earthly form he exhibits is a new creation by virtue of the absurd. He resigned everything infinitely, and then he grasped everything again by virtue of the absurd. He constantly makes the movements of infinity, but he does this with such correctness and assurance that he constantly gets the finite out of it, and there is not a second when one has a notion of anything else. It is supposed to be the most difficult task for a dancer to leap into a definite posture in such a way that there is not a second when he is grasping after the posture, but by the leap itself he stands fixed in that posture. Perhaps no dancer can do it–that is what this knight does." (Fear and Trembling, Soren Kierkegard, translated by Walter Lowrie, http://www.whitenationalism.com/etext/fear.htm )

Could you please rephrase the red sentences so that I can understand what the author means?

Thank you so much in advance.

Cadzao
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naturally jumping into a posture/stance/pose is very difficult
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Hi Cadzao, If you read Fear and Trembling (in any language) my hat's off to you. - A.

Kierkegaard left the task of discovering the meaning of the works to the reader, because "the task must be made difficult, for only the difficult inspires the noble-hearted".[4]
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Comments  
Cadzaothere is not a second when one has a notion of anything else.
One never thinks of anything else. No other thoughts ever come to one's mind -- not even for a second.
CadzaoIt is supposed to be the most difficult task for a dancer to leap into a definite posture in such a way that there is not a second when he is grasping after the posture, but by the leap itself he stands fixed in that posture.
People say that the most difficult task for a dancer is to leap so as to acheive a certain position in the air without thinking about it -- without ever actually trying to acheive that position -- but to acheive the position as if it were simply the most natural consequence of making the leap.
This is somewhat reminiscent of the story about the millipede. When asked how it managed to coordinate all those legs, the millipede began to think about it and explain it, and as a consequence got itself all twisted into knots and was unable to walk at all.
Some actions are done though the effort of thinking about them and trying them and practicing them. Other actions are accomplished instinctively, almost without trying.

CJ
He constantly makes the movements of infinity, but he does this with such correctness and assurance that he constantly gets the finite out of it, and there is not one second that can go by when you can think of anything else. It is supposed to be the most difficult task for a dancer to leap into a definite posture (a certain dance step or pose) in such a way that there is not a second when he is grasping after (trying to reach, attain) the posture, but at the first moment of the leap, he is already fixed in that position) by the leap itself he stands fixed in that posture. Perhaps no dancer can do it–that is what this knight does." (Fear and Trembling, Soren

I think it means that for this dancer, there is no "trying to get there" (into this leap) - he is already there at the first moment he even thinks of it.

Some sports figures also have this kind of mental and physical mindset.
 Marius Hancu's reply was promoted to an answer.
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Thank all of you for helping me. I greatly appreciate your kindness.

Cadzao.