Writing on paper is easy - fast and visible.
But paper tears, paper is thrown away.

Writing on the soil is easy - fast and visible.
But it can be erased, by a simple flick of the wrist.

Writing on water is hard, invisible and impossible.
Or so it seems.
To write on water, you must submerge something into it. A couple pebbles or sticks will be fit.

Live your life to the depths, never let it to brought down to be torn or erased. Submerge yourself in it, and it will always bring you to the top,