In Heart of Gold, what does "fine line" and "expressions I never give" mean? Lyrics given.?

I want to live, I want to give I've been a miner for a heart of gold. It's these expressions I never give That keep me searching for a heart of gold And I'm getting old. Keeps me searching for a heart of gold And I'm getting old. I've been to Hollywood I've been to Redwood I... show more I want to live,
I want to give
I've been a miner for a heart of gold.
It's these expressions I never give
That keep me searching for a heart of gold
And I'm getting old.
Keeps me searching
for a heart of gold
And I'm getting old.

I've been to Hollywood
I've been to Redwood
I crossed the ocean for a heart of gold
I've been in my mind, it's such a fine line
That keeps me searching for a heart of gold
And I'm getting old.
Keeps me searching
for a heart of gold
And I'm getting old.

PLEASE GIVE DETAIL!!!!
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