Swag said"Nothing in the world is more flexible and yielding than water. yet when it attacks the firm and the strong, none can withstand it, because they have no way to change it. So the flexible overcome the adamant, the yielding overcome the forceful."
that is a really interesting quote, and thoughtful for that matter. Water is such an amazing natural elelemtn. But i never thought about it being flexible. With strength comes flexibility.
I don't think it says "with strength comes flexibility" but rather that as strong as strength is, flexibility is more powerful because the strong can't resist it.
A rocky shoreline is strength against the sea. But the constant pounding of the waves turn the strong stone to sand, while the flexible water remains itself unchanged.
A thickened tree branch is stronger than a thin tree branch. But the weight of a good snow can crack a strong branch while the thin branch will give way to release the weight of the snow before it cracks. The snow defeats the strong limb ripping it from the tree and killing it., while the weaker yet flexible limb survives intact to continue growing through the seasons until it might be one day defeated by its own strength.
Our bodies require both strength and flexibility. Resistance training of the muscles keeps bones healthy where red blood cells are produced. Flexibility training stretches the body for good circulation and some studies have found that flexibility is the more important than strength training with regard to longevity.
I thought the quote unexpected because it was about being strong per your request but not in a way we'd normally anticipate strength to behave, yet appropriate; for as a new student going off to school, your friend will need to be strong but also he will need to be flexible, to understand new ideas which might crash against his preconceptions.