"Water is fluid, soft and yielding. But water will wear away rock, which is rigid and cannot yield. As a rule, whatever is fluid, soft and yielding will overcome whatever is rigid and hard. This is another paradox: what is soft is strong." 

-- Lao Tzu

I have just three things to teach:
simplicity, patience, compassion.
These three are your greatest treasures.
Simple in actions and in thoughts,
you return to the source of being.
Patient with both friends and enemies,
you accord with the way things are.
Compassionate toward yourself,
you reconcile all beings in the world.

--  Lao Tzu - Tao te Ching