theomania (thee-o-MAY-nee-uh, -MAIN-yuh) noun

The belief that one is God or specially chosen by God on a mission.

[From Greek theos (god) + -mania (excessive enthusiasm or craze).]

(via A.Word.A.Day.)

Jake: First you traded the Cadillac in for a microphone. Then you lied to me about the band. And now you're gonna put me right back in the joint!

Elwood: They're not gonna catch us. We're on a mission from God.