A nice pair.

Do you think you can improve the world? 

It can't be done. 
There is a time for being ahead,
and a time for being behind.
a time for being in motion, 
a time for being at rest
a time for being vigorous
a time for being exhausted 
a time for being in danger
a time for being safe

The wise one sees things as they are without resisting or grasping. 
She lets them go their own way and resides in the Tao in the center of the circle. 

from the Tao Te Ching, by Lao Tzu.