It was, like most of his songs, among my favourite listening as a kid. One set of words is found here:

Pen In Hand
 
WITH PEN IN HAND
(Bobby Goldsboro)
 
With pen in hand you sign your name
Today I find I'll be on that train
And you'll be free and i will be alone
So alone
If you think we can't find
The love we once knew
If you think I can't make
Everything up to you
Then I'll be gone
And you'll be on your own
You'll be on your own
 
Can you take good care of Jenny
Can you take her to school everyday
Can you teach her how to play
All the games that little girls play
Here what I say
Can you teach her how to roll up her hair
Can you make sure each night
That she says her prayers
Well if you can do these things
Then maybe she won't miss me
Maybe she won't miss me
 
And tonight as you lay
In that big lonely bed
And you look at that pillow
Where I laid my head
With your heart on fire
Will you have no desire
To kiss me
Or to hold me
And if you can forget
The good times that we had
If you don't think the good times
Outweigh the bad
Then go ahead and sign your name
And I'll be on my way
I'll be on my way