The Wanderer by Kahlil Gibran

Said one man to another, "At the high tide of the sea, long ago, with the point of my staff I wrote a line upon the sand; and the people still pause to read it, and they are careful that naught shall erase it."

And the other man said, "And I to wrote a line upon the sand, but it was at low tide, and the waves of the vast sea washed it away. But tell me, what did you write?"