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Heaven is everlasting, and Earth is endless. That they can last forever and go on without end is because they do not try to exist for themselves.
If one exists for oneself, he will contend with others, but if he does not exist for himself, others will come to him in submission.
Since reality is constantly in flux, it is not the thing-itself that is of importance, but rather the context that the thing exists in. The human that I am not is completely different then the person I was five years ago – we think differently, we look different, we are even made up of different cells. However, because of my human relationships, there exists a continuity of the self despite these dramatic changes. Similarly, my physical self has a continuity because, though the actual parts may be different, those that have changed have been replaced by parts made from the same template and remain in contact with older parts. In this way, we are ever-new and ever-changing but also the same.
Thus they can exist forever. As such, the sage places himself in the rear yet finds himself in front. He puts aside his person, yet his person is preserved. Is this not because he is utterly free of self-interest? This is how he can achieve self-fulfillment.
To be utterly free of self-interest [wusi] means to make no conscious effort for one’s own sake. Such a person will always find himself in front and his self preserved. This the text says, “He can achieve self-fulfillment.”
I think that Huainanzi, a philosopher commonly recognized as being a bridge between classical Daoism (such as the Daodejing) and Neo-Daoism (such as Wang Bi’s commentary), explained the linking of the microcosm and the macrocosm elegantly when he said,
–From Wing-tsit Chan’s A Source Book in Chinese Philosophy p. 308
By recognizing the unity of the macrocosm and the microcosm, the sage is said to be “selfless” because he is able to recognize himself in the macrocosm and he works tirelessly to benefit the whole and in this way tends to himself.