So, I went down to Del Mar beach today.
I built a castle all of sand today.
The tide came in and washed it all away.
Perhaps, I’ll build another one some day.
“But what’s the point,” I hear you laugh and say.
“The tide will come once more. Why build today?”
True enough,
Life is tough.
Castles made of sand don’t last.
They fall if they become too wet.
Indeed, if sun makes them too dry.
They fall if they are kicked by bully
They fall if stumbled into fully.
And, yet —-
Not so fast!
Is that a cause for tears to cry?
Does not each castle fall at last?
Does not each tower stone or steel
Become a ruin grown o’er by vine?
Into vinegar turns the wine?
Our smartest plans to check and slay
Forgotten on some distant day.
It’s not that turrets will forever stay.
The point is that the play itself’s the Way.
How the Nightingale Learned to Sing
petersironwood 
Peter, nicely done. Here are a few lyrics from Jethro Tull’s “Thick as a brick” which use your analogy. To me, the words are saying if you want change, you need to be steadfast and courageous. Keith
“And the sand-castle virtues are all swept away
In the tidal destruction the moral melee
The elastic retreat rings the close of play
As the last wave uncovers the newfangled way”
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