The grass is greener

When I was on the other side,
I saw the grass looking
Greener here;
But now that I am here,
It is no longer looking as green;
Instead, it looks greener
Over where I am coming from;
But why is this so?
And what lessons
Do we learn from this?
Tell me if you know;
And tell me you don’t know,
If you don’t know.
Where does the grass look
And why is this so?