# If my head were lifted up, you would stalk me like a lion

"When my head is lifted up, you stalk me like a lion"

# If my head were lifted up

"If I become proud"

# you would stalk me like a lion

God hunts Job like a lion hunts its prey or Job is like a lion being hunted by God.

# again you would show yourself with marvellous acts of power against me

This phrase expresses irony in how God displays his marvelous power by acting to harm Job.