Tao Te Ching 5

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.