Their first album is called Audioslave, released in 2002. It's a must-listen.

Favorite tracks: 1,2,3,6,7,9,10,11,12 (Yes I know it's more than half the album. The whole damn album is pure gold.)

I think there is a unifying theme to all the lyrics on the album: Cornell is struggling with faith in God. Is God Good? Is God real? Why doesn't he reveal himself? What about the problem of evil?

I think "I am the Highway" is sort of a Daoist, Book of Job-ish, apophatic resolution to his questions.