You are a loner and people should take you as you are.  You are just plain but important.  For without, the night, there would be no beauty in the moon and stars, without you the road, no transport is possible or easy etc.  You are the glue that holds everything together even though you are not the glamorous one.

Pearls and swine bereft of me..??   It means the best and worst are wearing you down constantly.

This is the first line in the awesome song "I am the highway" by Audioslave. But what does it actually mean? I really can't figure it out. I'll post the lyrics and a link to the song for context. Please help me all you music-lovers out there! :)

http://www.youtube.com/watch?v=cy2ZUGc2mSs

Pearls and swine bereft of me
Long and weary my road has been
I was lost in the cities
Alone in the hills
No sorrow or pity for leaving I feel

[Chorus]
I am not your rolling wheels
I am the highway
I am not your carpet ride
I am the sky

Friends and liars don't wait for me
I'll get on all by myself
I put millions of miles
Under my heels
And still too close to you
I feel

[Chorus]

I am not your blowing wind
I am the lightening lightning
I am not your autumn moon
I am the night
The night

[Chorus]

I am not your blowing wind
I am the lightening lightning
I am not your autumn moon
I am the night
The night