This song is about Neil's search for his capacity to feel compassion and his grappling with the looming despair of never finding it.
I interpret the first verse to be an introspective search for compassion within himself (for the kingdom within perhaps).
He begins with an aspiration - He wants to live and give. He admits, however that he has not realised his aspiration yet, but intends to continue the search (although he's "getting old").
The second verse alludes to the inevitable search-outside-himself that takes him far away from home (and perhaps his mission is driving him crazy? - I've been in my mind, its such a fine line).
The final verse refers to a second party (you keep me searching for a heart of gold) who, for whatever reason, tries his patience but ultimately this vexation only further drives him to continue the search.
In the end Neil is still in the hunt to realise his opening aspirations (i.e. he has not despaired) but he suspects that time (and I'm getting old - also a metaphor for the corrosion of cynicism, perhaps) may defeat him.