The Grand Design

Oh, why does light can't cast its own shadow?
Perhaps it does not have its own dark side;
Oh, why does mango bear but a mango?
Perhaps realizations in its bide.
If they had their chance, they might have changed it,
For life is not life that can be chosen;
But its path depends totally on it,
From the option after life has given.
Then to bear and to shine, be exercised,
From the onset till the crimson will set;
Proceed what have the author authorized,
To fulfill for everything is preset.
If then someone tries to change what have planned,
Will gain may be but not a full refund.