Showing the best and dividing it from the worst age vexes age,
Knowing the perfect fitness and equanimity of things, while
They discuss I am silent, and go bathe and admire myself.

from Walt Whitman – Song of Myself on Rap Genius

Meaning

The author says that he is separating the wheat from the cuff, and looking at the next senctences we can deduce what he means. As a spiritual being he has peace of mind, he isnt bothered from the illusions of our minds, of all kinds of everyday fears, constraints, worries and inflationary, unnecessary thoughts. And with his mind being at ease or under control of him respectively, he can be completely open to his surroundings, to life/to the magic of life, he perceives nature being in complete harmony. So he can just bathe in all this and enjoy himself.

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