Analysis of I'm not

I'm not here to tell anyone what to do.
I have enough problems with my own life,
To judge and bitch and spew.

We all have a mission if the truth be told,
I'm here for a season,
Writing what I'm told.

I have high expectations,
He will count the cost,
His arrows fly straight and true,
And hit the one that's lost.

His bow bent, heaven sent,
I copped quite a few.

Like cupid with his arrows,
He's coming after you.

The Lord is no man's debtor,
His revenue is sound.

See, I am here to praise the Lord,
While ever my bum points to the ground.