Poem explanation

Hello trainers,
Please tell me the summary of the following poem as I am unable to get it.

MONEY

When I had a money,money o!
I knew no joy till I went poor
For many a false ,man as a friend
Come knocking all day at my door,
Then felt I like a child that holds
A trumpet that he must not blow
Because a man is dead ; I dared
Not speak to let this false worlds know.
Much have I though of life , and seen
How poor men's hearts are hearts are ever light;

And how thier wives do hum like bees
About their work from morn till night.
So, when I hear these poor ones laugh,
And see the rich ones coldly frown-
Poor men, think I; need to go up
So much as rich men should come down
When I had money, money o!
My many friends proved all untrue
But now I have No money, o!
My friends are real , though very few.
William Henry Davies

Thanks a lot in advance