Deep Purple - The mule Lyrics

No one sees the things you do
Because I stand in front of you
But you drive me all the time,
Put the evil in my mind.
Used to sing and say my prayers
Live my life without a care
Now I have become a fool
Because I listened to the mule.
How can I change when my mind is a friend
Of a Lucifer hid in the ground
Just another slave for the mule.