What is Soft is Strong
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
heartquotes.net
Other links:
Be prepared to change
The world is a dangerous place
A great step to knowledge
Lessons for Life
Challenges