In order to be irreplaceable one must always be different.
There is a place in the world only you can fill
There is a song in your heart only you can sing
There is a life to be lived that is in your care
That is why you are different
And that's poetiquejustis
Do not be conformed to this world, but be transformed by the renewal of your mind, that by testing you may discern what is the will of God, what is good and acceptable and perfect.