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Tao Te Chingby Lao-Tse

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Heaven and earth do not act from (the impulse of) any wish to be benevolent; they deal with all things as the dogs of grass are dealt with. The sages do not act from (any wish to be) benevolent; they deal with the people as the dogs of grass are dealt with.

May not the space between heaven and earth be compared to a bellows?

   'Tis emptied, yet it loses not its power;
'Tis moved again, and sends forth air the more.
Much speech to swift exhaustion lead we see;
Your inner being guard, and keep it free.