meaning of "concentrate his thoughts"

[Learning_English]

He has the power to concentrate his thoughts.
Could you tell me what is `concentrate his thoughts'?
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Please let me know if I have made any mistakes in any of my sentences.

[Yankee]

Hi LE

I'd say that means he is able to focus his thoughts on single topics and resist thinking about unrelated topics when he is focused on something.
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"Nearly all men can stand adversity, but if you want to test a man's character, give him power." ~ Abraham Lincoln