one's own divinity or one's divine mission.
belief that one is a god
<psychiatry> A delusion in which one believes that he or she is God. ... Origin: G. Theos, god, + mania, frenzy ... (05 Mar 2000) ... 
Type: Term Pronunciation: thē′ō-mā′nē-ă Definitions: 1. A delusion in which one believes oneself God.
theomania, theomaniac A madness believed to be caused or inspired by God or an obsessive delusion that one is God.theomania 1. Delusion of being inspired by God. 2. A delusion that one is God. 3. A madness that is reputedly caused or inspired by God. 4. Religious insanity; especially that in which the patient thinks he or she is a deity or has divine inspiration to carry out some divine mission.