how much can one heart hold?

Just found the lyrics to the Kate Campbell song I referenced here back in February.

How Much Can One Heart Hold

Heard about a man from Birmingham
Went down to Selma to take a stand
How much can one heart hold
He sang some songs about peace and love
And took a beatin’ from a billy club
How much can one heart hold

How much can one heart hold
A pound of dirt or a pound of gold
We may never know the truth be told
How much can one heart hold

I met a woman who lost a son
On a chopper in South Saigon
How much can one heart hold
I couldn’t tell you all the tears she’s cried
I guess she’s gonna ‘til the day she dies
How much can one heart hold

If the heart is a bottomless pit
You gotta watch what you put in it
How much can one heart hold
Before you know it you’re carrying around
A ton of stuff that’ll weigh you down
How much can one heart hold