The Indispensable Human

When you're feeling important, when your ego's in bloom
When you take it for granted, you're the best in the room
When you feel that you're going, would leave an unfilled hole,
Follow these simple instructions, and see how it humbles your soul.
Take a bucket and fill it with water, put your hand in up to your wrist,
Pull it out and the hole that's remaining, is a measure of how you'll be missed.
You may splash all you please when you enter, you can stir up the water galore,
But stop and you'll find in a minuter, that it looks quite the same as before.
The moral in this quaint example, is to do just the best that you can,
Be proud of yourself but remember, there's no indispensable human!